前有do后无to的用法
前有do后无to的用法 (1)
前有do后无to1.all,thing等带有的定语从句中若含有实义动词do时(如：do,does,did,done,etc,do可以不是谓语动词，但必须是实义动词。
此用法中do就是do本身，而不是代动词，如write, take, want等就不是do。
)，作表语的不定式就要省略to.Eg:All that I can do is wait.The only thing that I can do is wait.2.What引导的主语从句中若含有实义动词do,作表语的动词不定式要省略to.Eg:What I want to do next Sunday is see my grandparents .3. have nothing to do but do但have no choice/alternative but to do Eg:I have nothing to do but watch TV all day long.Tom had no choice but to give it up.可引申到nothing but,Eg:He did nothing but piddle away the time.他不做事，只是混日子。
He could do nothing but stand and wonder.他只得惊奇地站著不动。
Jim does nothing but play basketball in the morning.Now I want nothing but to go off to the Western Hills. This man lives for nothing but to gather money.这个人的一生除了聚财以外别无目地。
Jim chose nothing but to buy a basketball that morning.。
(完整版)省略to的动词不定式用法归纳
省略to的动词不定式用法归纳一、使役动词与to的省略当不定式用于let, make, have等使役动词后作宾语补足语，不定式必须省略to。
如：Let me have another cup of tea.给我再来一杯茶。
She had him dig away the snow.她让他把雪挖走。
They made him tell them everything.他们强迫他把一切全告诉他们。
但是，当使役动词用于被动语态时，其后的不定式则必须要带to。
如：他被迫一天工作20小时。
误：He was made work twenty hours a day.正：He was made to work twenty hours a day.注意，表示使役意义的let和have很少用于被动语态。
另外注意，force, oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：They forced her to sign the paper.他们强迫她在文件上签字。
The law obliged parents to send their children to school.法律要求父母送子女上学。
考例：1.The teacher forbade ________ our seats. to leave leavingC.to leaveD.to leaving2.Mary had her friend ________ the best one.A.chooseB.chosenC.choseD.to choose3.The girl was ma de _________ she didn’t love at all.A.marry a manB.to marry a manC.to marry with a manD.married with a man二、感觉动词与to的省略当不定式用于表示感觉的动词feel, hear, notice, observe, see, watch, look at, listen to等作宾语补足语时，不定式必须省略to。
不带to的动词不定式通常有下面十八种情况
(1)We found the farm crops(to) do well.
(2)I find the Chinese people to be happy and cheerful.
(8)I had sooner live on a farm than in the city.
(9)He would sooner resign than take part in such dishonest business deeds.
(8)He observed someone open the door.
(9)I did not perceive anyone come in.
(10)He beheld her go out.
(5)Could you do something for me?
(6)You shall go at once.
(7)He might be working in the office now.
(4)I heard her play the piano.
(5)He listend to us talk.
(6)I felt the floor move.
(7)I didn’t notice you enter.
不带to的动词不定式通常有下面十八种情况.txt今天心情不好。我只有四句话想说。包括这句和前面的两句。我的话说完了对付凶恶的人，就要比他更凶恶；对付卑鄙的人，就要比他更卑鄙没有情人味，哪来人情味 拿什么整死你，我的爱人。收银员说：没零钱了，找你两个塑料袋吧！ 不带to的动词不定式通常有下面十八种情况
(新)高中英语语法讲解——非谓语动词
非谓语动词非谓语动词的种类：不定式（to do）、动名词（doing）、现在分词（doing）、过去分词（V-ed）不定式：表将来、表目的1. 表示将要发生的动作或即将要做的事。
即表示发生在谓语动作之后的动作。
如：I expect him to arrive tomorrow. 我预计他明天到达。
I hope to catch an early train. 我希望赶上早班火车。
2. 表示同时发生的动作，即表示与谓语动作同时发生或略先于谓语动作的动作。
如：Who heard him say that? 是谁听到他这样说的？(say 与heard 几乎同时发生)3. 表示一般情况，即看不出动作的先后关系，而是表示一种情况或现象。
如：Washing the car seems to be your main hobby. 擦洗汽车似乎是你的主要爱好。
None of her many lovers seemed to want to marry her. 在她的许多情人中似乎没有一个愿意娶她的。
不定式省略to的基本规律一、使役动词后省略to的情况在let, make, have 等使役动词后用作宾语补足语的不定式必须省略to。
如：My mother wouldn’t let me go to the film. 我妈妈不会让我去看电影的。
I don’t like milk, but mother made me drink it. 我不喜欢牛奶，可是母亲强迫我喝。
注意：当使役动词用于被动语态时，要补上在主动语态中省略的to二、感觉动词后省略to的情况see, hear, observe, notice, feel, watch在感觉动词后用作宾语补足语的不定式必须省略to。
如：I watched her get into the car. 我看着她上了车I saw the woman enter a bank. 我看见这个女人进了一家银行。
介词but后的动词带不带to主要看前面有没有do
介词but后的动词带不带to主要看前面有没有do请看看下面这道题：He did nothing but __________ a letter.A. writeB. to writeC. writingD. to have written此题应选A。
一般说来，介词后接动词通常应是动名词。
但是介词but(except也一样)却比较特殊，其后接动词时，可以接不定式，并且这个不定式可以带to也可以不带to：1. 当其前的谓语含有实义动词do(可以是各种形式)时，其后的不定式通常不带to：She will do anything but play chess. 她除了下棋外什么都愿干。
He did nothing all day except watch TV. 他一整天除了看电视什么也没做。
2. 当其前的谓语没有某种形式的实义动词do时，其后的不定式通常要带to：They had no choice but to obey. 他们别无选择只有服从。
He wanted nothing but to stay here. 他除了想呆在这里外，其他什么也不想。
We have no choice but to arrive late. 除了迟到以外，我们并无选择。
We have no choice but to turn back. 没办法，我们只有回去。
You have no choice but to give up. 你别无选择，只能投降。
3. 当其前含有实义动词do但不是用作谓语时，其后的不定式带不带to均可，但以不带to 为多见：There’s nothing to do but (to) leave.只好离开。
There was nothing to do but (to) wait. 除了等没有其他的办法。
At present I can do nothing but wait. 目前, 我只好等待。
英语动词不定式语法知识点归纳总结
英语动词不定式语法知识点归纳总结动词不定式考向一不定式的作用1. 作主语：不定式作主语时，谓语用单数。
往往用it 作形式主语，把不定式放在谓语后面。
It took us two hours to finish the job.2. 作宾语（1）动词+不定式。
☞He managed to escape from the fire.☞I find it hard to get along with him. （it 作形式宾语）（2）动词+疑问词+to，＂特殊疑问句+不定式＂相当于名词，作宾语。
☞I don’t know what to do next/ how to do it next.不定式短语作宾语时，如果还带有宾语补足语，往往把不定式短语放在宾语补足语之后，用it 作形式宾语。
☞I find it necessary to learn a foreign language.3. 作宾语补足语（1）动词+宾语+不定式（to do ）。
☞He warned me to be careful.注意：可以用动词不定式作宾补的动词有：ask，tell，order，want，get，would like，like，advise，invite，allowhelp，wish，warn，expect，would prefer，encourage。
（2）表见解、看法的动词结构可为：动词+宾语+ to be 的不定式结构。
☞We consider Tom to be one of the best students in our class.The book is believed to be useful.（被动语态）（3）There +不定式。
We didn’t expect there to be so many people there. 我们没料到会有那么多人在那里。
（4）在动词feel （一感），hear, listen to（二听），have, let, make（三让），notice, see, watch, observe, look at（五看）(即：吾看三室两厅一感觉)等后面的补足语中，不定式不带to，但变为被动语态后，必须带to。
前有do后无to的用法
For personal use only in study and research; not for commercial use前有do后无to的用法。
具体参考如下：（1）连词连接两不定式前面的有do后面的to do的to省略，如：I have nothing to do but watch TV all day long. 短语：have nothing to dobut do….Tom have no choice but to give it up. 短语：have no choice but to do在nothing but句型中,有do无to是指nothing 前有do的任何形式出现,but后的动词前就不能出现to,如:He did nothing but piddle away the time.他不做事，只是混日子。
He could do nothing but stand and wonder.他只得惊奇地站著不动。
Jimdoes nothing but play basketball in the morning.Now I want nothing but to go off to the Western Hills.This man lives for nothing but to gather money.这个人的一生除了聚财以外别无目地。
Jim chose nothing but to buy a basketball that morning.（2）用is连接，不定式作表语时前面主语有do时后面表语to do的to省略，如：What I want to do is stay at home.What I want to do next Sunday is see mygrandparents .The only thing that he can do is wait.What I want is to stay with you.（3）注意这里说的前有do后无to的前面的do要是实意动词do,不能是助动词do自测题：1. He did nothing but ____.A.sleepingB.to sleepC.sleptD.sleep2. He said nothing but ____there.A.stoodB.standC.standingD.to stand3. I have no choice but ____ up this badbehavior.A.giveB.to giveC.givingD.givenFor personal use only in study and research; not for commercial use.Nur für den persönlichen für Studien, Forschung, zu kommerziellen Zwecken verwendet werden.Pour l 'étude et la recherche uniquement à des fins personnelles; pas à des fins commerciales.толькодля людей, которые используются для обучения, исследований и не должны использоваться в коммерческих целях.以下无正文For personal use only in study and research; not for commercial use.Nur für den persönlichen für Studien, Forschung, zu kommerziellen Zwecken verwendet werden.Pour l 'étude et la recherche uniquement à des fins personnelles; pas à des fins commerciales.толькодля людей, которые используются для обучения, исследований и не должны использоваться в коммерческих целях.以下无正文For personal use only in study and research; not for commercial use。
不定式的用法
不定式的用法一、考点、热点回顾（一）不定式的用法1.不定式作主语⑴原则上，可用动词不定式直接作句子的主语，通常用it 作句子的形式主语，而把不定式移到后面，形成“It + 谓语… + 动词不定式…”的句型。
如：To catch the 5：00 bus early in the morning is not a good idea.It is not a good idea to catch the 5：00 bus early in the morning.To learn a foreign language well takes painstaking efforts.It takes painstaking efforts to learn a foreign language well.⑵若要说明不定式的动作的执行者，可以在不定式前面加上“for + 名词或代词”结构，或是“of + 名词或代词”结构。
It is a great pleasure for me to talk with him. It is very kind of you to help me .⑶可用于“of + 名词/代词 + 动词不定式”结构中作主语补足语的形容词是指那些可以表示人或事物的性质或品质的好坏的形容词。
这些词如：careful，cruel，foolish，bold，brave，good，honest，kind，rude，polite，nice，stupid，selfish，silly，wicked，wise，thoughtful，wrong等。
2.不定式作宾语不定式作宾语有两种情况：一是及物动词后直接跟带to的不定式，二是“动词+疑问词+带to的不定式”。
⑴“动词+带to的不定式”结构：常见的以不定式作宾语的动词有afford，appear，agree，ask，believe，decide，demand，desire，fail，hope，intend，learn，mean，offer，promise，refuse，wish等。
高考英语省略to的动词不定式八种情况
高考英语省略to的动词不定式八种情况一、感觉动词后省略to的情况主语+ (四看see/watch/notice/look at,三使役let/make/have，两听listen to/hear, 一感觉feel)+宾语+do sth，省略to。
1. 在感觉动词后用作宾语补足语的不定式必须省略to。
1）这里所说的感觉动词主要包括see, hear, observe, notice, feel, watch等。
但是它们用于被动语态时，其后的不定式必须带to。
如：The woman was seen to enter a bank. 有人看见这个女人进了一家银行。
但是，用于以上句型的动词notice 和watch和通常不用于被动语态。
2）类似地，动词look at和listen to后用作宾语补足语的不定式也不带to。
如：We listened to the old man tell his story. 我们听这位老人讲述他的经历。
3）若动词feel后用作宾语补足语的不定式为to be，则要带to(其他情况不带to)。
如：They felt the plan to be unwise. 他们认为这个计划不明智。
4）若不定式为完成式，通常应带to。
如：I noticed her to have come early. 我注意到她来得很早。
2. 使役动词后省略to的情况在let, make, have等使役动词后用作宾语补足语的不定式必须省略to。
如：My mother wouldn’t let me go to the film. 我妈妈不会让我去看电影的。
1) 当使役动词用于被动语态时，要补上在主动语态中省略的to(主要是指make，let和have很少用于被动语态)。
2) force, oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：He forced me to go with them. 他迫使我同他们一起去。
英语中不定式省略to的10种情况
英语中不定式省略to的10种情况一、使役动词与to的省略当不定式用于let, make, have等使役动词后作宾语补足语，不定式必须省略to。
如：Let me have another cup of tea. 给我再来一杯茶。
She had him dig away the snow. 她让他把雪挖走。
They made him tell them everything. 他们强迫他把一切全告诉他们。
但是，当使役动词用于被动语态时，其后的不定式则必须要带to。
如：他被迫一天工作20小时。
误：He was made work twenty hours a day.正：He was made to work twenty hours a day.注意，表示使役意义的let和have很少用于被动语态。
另外注意，force, oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：They forced her to sign the paper. 他们强迫她在文件上签字。
The law obliged parents to send their children to school. 法律要求父母送子女上学。
二、感觉动词与to的省略当不定式用于表示感觉的动词feel, hear, notice, observe, see, watch, look at, listen to等作宾语补足语时，不定式必须省略to。
如：We all felt the house shake. 我们都感觉这房子在震动。
I heard him go down the stairs. 我听见他下楼了。
Did you notice her leave the house? 她离开屋子你注意到了吗?I watched her get into the car. 我看着她上了车。
但是，当feel后用作宾语补足语的不定式为to be时，则不能省略to。
英语语法(虚拟语气,名词性从句,情态动词,非谓语动词)
非谓语动词非谓语动词的种类：不定式（to do）、动名词（doing）、现在分词（doing）、过去分词（V-ed）不定式：表将来、表目的1. 表示将要发生的动作或即将要做的事。
即表示发生在谓语动作之后的动作。
如：I expect him to arrive tomorrow. 我预计他明天到达。
I hope to catch an early train. 我希望赶上早班火车。
2.表示同时发生的动作，即表示与谓语动作同时发生或略先于谓语动作的动作。
如：Who heard him say that? 是谁听到他这样说的？(say 与heard 几乎同时发生)3.表示一般情况，即看不出动作的先后关系，而是表示一种情况或现象。
如：Washing the car seems to be your main hobby. 擦洗汽车似乎是你的主要爱好。
None of her many lovers seemed to want to marry her. 在她的许多情人中似乎没有一个愿意娶她的。
不定式省略to的基本规律一、使役动词后省略to的情况在let, make, have 等使役动词后用作宾语补足语的不定式必须省略to。
如：My mother wouldn’t let me go to the film. 我妈妈不会让我去看电影的。
I don't like milk, but mother made me drink it. 我不喜欢牛奶，可是母亲强迫我喝。
注意：当使役动词用于被动语态时，要补上在主动语态中省略的to二、感觉动词后省略to的情况see, hear, observe, notice, feel, watch在感觉动词后用作宾语补足语的不定式必须省略to。
如：I watched her get into the car. 我看着她上了车I saw the woman enter a bank. 我看见这个女人进了一家银行。
不定式省略to的10种情况
不定式省略to的10种情况摘自《第二课堂》（原作者：黄静香）一、使役动词与to的省略当不定式用于let, make, have等使役动词后作宾语补足语，不定式必须省略to。
如：Let me have another cup of tea. 给我再来一杯茶。
She had him dig away the snow. 她让他把雪挖走。
They made him tell them everything. 他们强迫他把一切全告诉他们。
但是，当使役动词用于被动语态时，其后的不定式则必须要带to。
如：他被迫一天工作20小时。
误：He was made work twenty hours a day.正：He was made to work twenty hours a day.注意，表示使役意义的let和have很少用于被动语态。
另外注意，force, oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：They forced her to sign the paper. 他们强迫她在文件上签字。
The law obliged parents to send their children to school. 法律要求父母送子女上学。
二、感觉动词与to的省略当不定式用于表示感觉的动词feel, hear, notice, observe, see, watch, look at, listen to 等作宾语补足语时，不定式必须省略to。
如：We all felt the house shake. 我们都感觉这房子在震动。
I heard him go down the stairs. 我听见他下楼了。
Did you notice her leave the house? 她离开屋子你注意到了吗?I watched her get into the car. 我看着她上了车。
但是，当feel后用作宾语补足语的不定式为to be时，则不能省略to。
不带to的动词不定式通常有下面十八种情况
不带to的动词不定式通常有下面十八种情况之羊若含玉创作动词不定式通常带有符号to，叫做带to的动词不定式(infinitive with"to")，动词不定式有时不带符号to，叫做不带to的动词不定式(infinitive without"to")不带to的动词不定式通常有下面十八种情况一、与助动词do连用组成谓语动词的否认、疑问和强调形式. (1)hedoesnotworkinthefactory.(2)Does she work here？(3)I did not see her yesterday.(4)Did they take you home?(5)He does looktired.(6)They did come yesterday.二、与情态动词连用组成复合谓语(1)I can speak English.(2)May I come in?(3)Dare he swim across the river?(4)We must work,and above all we must believe in ourselves.(5)Could you do something forme?(6)You shall go at once.(7)He might be working in the office now.(8)I don't think you need have come yesterday.(9)They should be here by now.(10)If you will go into the fields and turn over a fewbig stones,you are sure to uncover a city of ant"people".但与情态动词ought(to)连用时通常带to，和used(to)连用时必须带to三、在暗示感到的动词如：see,look.at,watch,hear,listento,feel,notice,observe,perceive(发觉，看见),behold（书面用语“见到”）等后用作宾语补足语的动词不定.(1)I saw her cross thestreet.(2)He looked at the children walk up the hill.(3)I watched the boy cross the road.(4)I heard her play the piano.(5)He listend to us talk.(6)I felt the floor move.(7)I didn’t notice youenter.(8)He observed someone open the door.(9)I did not perceive anyone comein.(10)He beheld her go out.但除notice,watch不必主动语态外，上述动词变成主动语态时，其后的动词不定式就不省to(1)She was seen to cross street.(2)She was heard to play the piano.四、使役动词make,let,have,bid, leave(=let)后作宾语补足语的动词不定式不带to(1)You may take a horse to the water,but you can't make him drink.(2)I'll let him do it.(3)Don't forget to have them come.(4)Bid him go home.(5)Leave him go.动词have通常不必于主动语态，make和bid可用于主动语态，let偶然也可用于主动态，用作主语补足语的动词不定式通常带to，但在make和let后有时可以不带to(1)John was made to wash the truck for a week as a punishment.(2)He was made(to) laugh.(3)The child was let(to) do it.五、never与know连用其后作宾语补足语的动词不定式可省to，其时态多为完成时态.(1)I never knew him act without thinking.(2)I've never known it snow in July before.(3)I had never known her ask for pity before.有时ever与known连用也有上述用法.(1)Have you ever known me tell a lie?六、在find后作宾语补定语的动词不定式有时可以省to，但如动词为be，那么一般不省to，要省一起省略"to be"(1)We found the farm crops(to) do well.(2)I find the Chinese people to be happy and cheerful.(3)I found this to be true in all the cities.(4)We found him (to be) honest/dishonest.七、在cannot but,cannot help but,can not choose but, had better(best),would(had) rather(sooner)…than…, would assoon…as…后的动词不定一般不带to(1)When the country calls you for help,you cannot but go.(2)He can't help but feel sorry for her.(3)he cannot choose but obey.(4)I had better leave now,or I'll be late.(5)He had best buy it now while it is still available.(6)I would rather go mountain—climbing than just take a walk.(7)My aunt invited me to the movies,but I said I had rather go on a picnic with the girls.(8)I had sooner live on a farm than in the city.(9)He would sooner resign than take part in such dishonest business deeds.(10)I'd rather not tell you.(11)He said he'd sooner die than betray his friend.八、在but(=except),besides,than后的动词不定式一般要带to，但如果其前有作谓语的实义动词do，则不定式不带to(1)The soldier has no choice but to obey.(2)He did not have any choice but to obey.(3)She did nothing but clean the dishes.(4)The children found there was nothing they could do with their money,except spend it on sweets.(5)There seemed nothing else to do but(to)send for a doctor.(but前的实义动词do不作谓语，but后的不定式可带to，也可不带to)(6)He did nothing else than laugh.(7)I could hardly do less than wait.九、不定式作表语时，如主语部分含有实义动词do，且句子的时态为一般现在时或一般曩昔时(多为is或was)，不定式可以带to也可不带to(1)What we must do now is(to) find anther person to help us.(2)All he could do was (to) rush into the room.如句子的动词时态不是一般现在时或一般曩昔时，作表语的动词不定式一般要带to(1)She knew that all she would have to do would be to stop crying.十、rather than位于句首时，其后用不带to的不定式，但ratherthan在句中时，其后的动词不定式可以带to，也可以不带to(1)Rather than ride on a crowded bus,he always prefers to ride a bicyde.(2)Rather than cause trouble,he left.(3)He prefers to rent a car rather than(to) have one of his own.十一、在动词help后作宾语补足语的动词不定式可以带to，也可以不带，在英国英语中，多用不带to的不定式，但在英国英语中，help+宾语+不定式构造中，用不带to的不定式暗示主语直接介入不定式的暗示的动作，用带to的不定式暗示主语没有直接介入不定式的暗示的动作.(1)He helped me repair the bicycle.(2)He helped me to repair the bicycle.(3)This kind of soap helps us to wash the clothes more easily.(4)The book will help you to study English.但在主动语态中，help后的不定式要带to(1)She was helped to repair her bicycle.在help(to) do sth不定式符号to可省略.He helped(to) repair the machine.十二、两个或两个以上的动词不定式并列在一起时，第一个不定式带to，后面的不定式一般省去to(1)Her job is to take care of the children and washclothes.(2)The girl doesn't know how to read and write.但如果是在对比场合，则不省去to(1)It is better to laugh than to cry.(2)The purpose of new technologies is to make life easier,not to make it more difficult.十三、than衔接两个动词不定式没有比较关系时，后一个不定式可以省to(1)You might do worse than(to) do as he does.(2)I cannot do better than(to)get away for the few days.下面句子中than衔接的不是两个动词不定式than后的动词不定式通常要带to(1)I know better than to believe him.(2)The beaten enemy had no choice than to surrender.下句中的more than(=only)可以算作复合副词，后面的动词不定式不带to(1)I did not more than make a beginning.十四、在why,why not后的不定式不带to(1)Why spend such a lot ofmoney?(2)Why not join us?(3)Why don't you smoke?十五、实义动词dare在现代英语白话中，其所在的否认句或疑问句中，它后的动词不定式可省to，尤其在一般曩昔时中(1)Does he darego?(2)We do not dare speak.(3)He did not darego.(4)Did he dare go?(5)He dared go.(6)Dared he go?(7)He knew she dared not open his mouth.十六、在白话中，特别是在美国，祈使语气谓语动词和组成谓语的不定式go后面的不定式往往不带to (1)Goaskher. (2)I'llgoseemybrother.这种用法在英国白话中比较少见，一般在动词go后用连词and (1)GOandaskher.(2)I'll go and see my brother.十七、在"will you please…?"和would you please…?句型中，要用不带to的不定式.(1)Will you please give the note toTom?(2)Will you please open the window?(3)Would you please give me a hand?十八、Better+动原(白话中用)(1)Better ask them go astray.(2)Better go at once.。
不定式中省去to的十种情况
一、使役动词与to的省略
<注意2> get, force, oblige等虽然也表示“使”，但它们后用作 宾 语补足语的不定式必须带to。
Eg. 1.They forced her to sign the paper. 他们强迫她在文件上签字。 2.The law obliged parents to send their children to school. 法律要求父母送子女上学。 3. You can get him to finish his homework. 你可以让他完成他的作业。
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二.感觉动词与to的省略
当不定式用于表示感觉的动词feel, hear, notice, observe, see, watch, look at, listen to, sense等作宾语补足语时，不定式必须省 略to。 eg. 1.We all felt the house shake.
我宁愿走着去，而不愿坐公共汽车去。 4. may/might as well+动词原形，意为“不妨做……” eg. You might as well go without her.
你们还是不带她去为好。
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十.固定搭配与to的省略
5.can not but
cannot choose but
听见他们在隔壁打破了一个玻璃杯子。 <注意3> 若用作宾语补足语的不定式为完成式，则通常应带 to。 eg. I noticed her to have come early.
我注意到她来得很早。
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三.介词except / but与to的省略
当不定式用作介词except / but的宾语时，大致原则是：其前有 do，不定式不带 to；其前没有 do，不定式通常带 to。 eg. 1.He likes nothing but to watch TV.
But后面的用法
三． but 后接不带 to 的不定式的情况1 ．当 but 前是实义动词 do 的各种形式时， but 后接不带 to 的不定式，即接动词原形。
如：Mary did nothing but write a letter last night.玛丽昨晚只写了一封信。
We can do nothing but ask you for help.我们只得请你帮忙了。
I hate doing nothing but look on.我讨厌袖手旁观，什么事也不干。
What can you do but take back what you said?除了收回你的话外，你还能做什么？She can do anything but sing.她除了不会唱歌，什么都会。
Last evening I did nothing but repair my farm tools.昨天晚上我除了修理农具外，没有做别的事。
2 ． but 前有 can/could, can't/couldn't(help), can't choose 等时， but 后接不带 to 的不定式。
如：He can't but agree. 他不得不同意。
I could not help but realize that something was wrong.我这才真的意识到出了什么事了。
One's world outlook can't but come through in what one says and does.一个人的世界观必然会在他的言行中表现出来。
We could not but weep at the sad news.听到这悲痛的消息，我们不禁怆然泪下。
The young woman could not choose but leave her children at home.那年轻妇女只好将孩子留在家中。
高中英语语法讲解——非谓语动词
非谓语动词非谓语动词的种类：不定式〔to do〕、动名词〔doing〕、现在分词〔doing〕、过去分词〔V-ed〕不定式：表将来、表目的1. 表示将要发生的动作或即将要做的事。
即表示发生在谓语动作之后的动作。
如：I expect him to arrive tomorrow. 我预计他明天到达。
I hope to catch an early train. 我希望赶上早班火车。
2. 表示同时发生的动作，即表示与谓语动作同时发生或略先于谓语动作的动作。
如：Who heard him say that? 是谁听到他这样说的？(say 与heard 几乎同时发生)3. 表示一般情况，即看不出动作的先后关系，而是表示一种情况或现象。
如：Washing the car seems to be your main hobby. 擦洗汽车似乎是你的主要爱好。
None of her many lovers seemed to want to marry her. 在她的许多情人中似乎没有一个愿意娶她的。
不定式省略to的基本规律一、使役动词后省略to的情况在let, make, have 等使役动词后用作宾语补足语的不定式必须省略to。
如：My mother wouldn’t let me go to the film. 我妈妈不会让我去看电影的。
I don’t like milk, but mother made me drink it. 我不喜欢牛奶，可是母亲强迫我喝。
注意：当使役动词用于被动语态时，要补上在主动语态中省略的to二、感觉动词后省略to的情况see, hear, observe, notice, feel, watch在感觉动词后用作宾语补足语的不定式必须省略to。
如：I watched her get into the car. 我看着她上了车I saw the woman enter a bank. 我看见这个女人进了一家银行。
英语中不定式省略to的九种情况
英语中不定式省略to的九种情况一、使役动词后省略to的情况在let，make，have等使役动词后用作宾语补足语的不定式必须省略to。
如：My mother wouldn't let me go to the film. 我妈妈不会让我去看电影的。
I don't like milk，but mother made me drink it. 我不喜欢牛奶，可是母亲强迫我喝。
I would have him wait for me at the gate of the park. 我要他在公园门口等我。
注意：1. 当使役动词用于被动语态时，要补上在主动语态中省略的to(主要是指make，let和have很少用于被动语态)。
2. force，oblige等虽然也表示“使”，但它们后用作宾语补足语的不定式必须带to。
如：He forced me to go with them. 他迫使我同他们一起去。
The police obliged him to leave. 警方强迫他离开。
二、感觉动词后省略to的情况在感觉动词后用作宾语补足语的不定式必须省略to。
如：I watched her get into the car. 我看着她上了车。
I saw the woman enter a bank. 我看见这个女人进了一家银行。
We often hear her sing this song. 我们经常听到她唱这首歌。
Did you notice her leave the house？她离开屋子你注意到了吗？注意：1. 这里所说的感觉动词主要包括see，hear，observe，notice，feel，watch等。
但是它们用于被动语态时，其后的不定式必须带to。
如：The woman was seen to enter a bank. 有人看见这个女人进了一家银行。
但是，用于以上句型的动词notice 和watch通常不用于被动语态。
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前有do后无to的用法。
具体参考如下：
（1）连词连接两不定式前面的有do后面的to do的to省略，如：
I have nothing to do but watch TV all day long. 短语：have nothing to dobut do….
Tom have no choice but to give it up. 短语：have no choice but to do
在nothing but句型中,有do无to是指nothing 前有do的任何形式出现,but后的动词前就不能出现to,如:
He did nothing but piddle away the time.他不做事，只是混日子。
He could do nothing but stand and wonder.他只得惊奇地站着不动。
Jimdoes nothing but play basketball in the morning.
Now I want nothing but to go off to the Western Hills.
This man lives for nothing but to gather money.这个人的一生除了聚财以外别无目地。
Jim chose nothing but to buy a basketball that morning.
（2）用is连接，不定式作表语时前面主语有do时后面表语to do的to省略，如：
What I want to do is stay at home.
What I want to do next Sunday is see mygrandparents .
The only thing that he can do is wait.
What I want is to stay with you.
（3）注意这里说的前有do后无to的前面的do要是实意动词do,不能是助动词do
自测题：
1. He did nothing but ____.
sleep
2. He said nothing but ____there.
stand
3. I have no choice but ____ up this badbehavior.
give。