区别one that和it
It和one,one和the one,the one和that,those和they替代词的用法区别
It和one，one和the one，the one和that，ones和the ones，that和those，that和it，those 和they七组替代词的用法区别■替代词it与one的区别一般说来，it表特指，相当于“the+名词”，表示与前面提到的事物为同一物；one表泛指，相当于“a+名词”，表示与前面提到的人或事物为同类，但并非同一。
比较：I can’t find my pen. Have you seen it?我找不到我的钢笔了，你看到过它吗？I can’t find my pen. I think I must buy one. 我找不到我的钢笔了，我想我得去买一支。
另外，注意it与the one的区别：虽然it和the one均表特指，但it后不能接定语短语或定语从句，而the one后面则通常要接定语短语或定语从句。
如：My room is better than the one next door. 我的房间比隔壁房间好。
He was the one who told the police. 告诉警察的就是他。
■替代词one与the one的区别one用作替代词主要用于替代“a＋单数可数名词”，表泛指；若需特指，则用the one。
两者均可受定语短语或定语从句的修饰。
如：A fast train is one that goes fast. 快车是一种行驶快的火车。
The accident was similar to one that happened in 2005. 这个事故与发生在2005年的事故类似。
Open the drawer on the left, the one with a key in it. 打开左边的抽屉，上面有钥匙的那个。
Here are six rings. Pick out the one you like best. 这里有六枚戒指，选出你最喜欢的一枚。
it,one,ones,that,those的区别用法
it,one,ones,that,those的区别用法it,one,ones,that,those的区别用法为使表达简洁明了，我们常用it，one，ones，that，those 等替代词来替代前面已经出现的名词。
从近几年的高考英语情况来看，考查替代词的用法和区别一直是一个热点。
本文拟就以上几个最重要的替代词的用法作一小结，同时为同学们归纳一些使用技巧，希望对大家有所帮助。
一、替代表泛指的单数名词替代表泛指的单数名词，通常用one。
如：Two heads are better than one. 两人智慧胜一人。
I lost my old camera; this is a new one. 我的旧相机丢了，这是一架新的。
Did you get a ticket?—Yes，I managed to get one. 你搞到票了吗?——是的，我设法搞到了一张。
注：若one 前没有形容词的修饰，则其前不能有不定冠词。
比较：I’m looking for a flat. I’d like a small one with a garden. 我正在找一套公寓，想找一套小的带花园的。
I’m looking for a flat. I’d like one with a garden. 我正在找一套公寓，想找一套带花园的。
（不能说：... a one with a garden.）没有形容词修饰的one 前不能用不定冠词，但可用another。
如：This pen doesn’t work. I must buy another one. 这支钢笔坏了，我要另买一支了。
另外，注意它与表特指的it 的区别。
如：Can you lend me a pen?—Sorry. I haven’t got one. 你能借给我一支钢笔吗?——对不起，我没有钢笔。
Can I borrow your pen?—Sorry，I’m using it. 我能借用你的钢笔吗?——对不起，我自己正在用。
one，that和it的用法和区别
one，that 和it的用法和区别以下是小编为大家整理的one，that 和it的用法总结，希望能帮助大家提高英语水平。
一、that的用法1、that用来指前文中确定的非同一事物，常用来替代与定冠词或形容词性物主代词连用的单数可数名词或不可数名词，相当于“the+名词”，其复数形式为those。
2、that表替代时为始终是特指(作指示代词和关系代词用时另论)，可指上文谈到的人、物或情况(均为单数)，可代替可数名词和不可数名词。
3、若that所代替的内容为前置用法，即要代替的内容将出现在下文中，一般用this,these或the following表示。
1.—He was nearly drowned once—When was_______?(NMET2002 Beijing spring)—_____was in 1998 when he was in middle school.A.that,ItB.this,ThisC.this,ItD.that,This2.Equipped with modern facilities, today’s libraries differ from______ (2003 Shanghai spring,26)A.those of the pastB.the pastC.which of the pastD.those past3.Few pleasure can equal __of a cool drink on a hot day. (NMET99,17; NMET99 Guangdong,29)A.some B,any C.that D.those4.The population of Sichuan Province is larger than ____of any province in China.A.oneB.itC.thatD.the one5.What I want to suggest is_____: Everyone should have another try. We needn’t only wait for help.A.thatB.thisC.itD.one6.You see, the accident happened like_____: The red car hit the bus and made all the traffic stop.A.thatB.thisC.itD.one7.Listen! ________ is about the lessons we will have to finish today.A.ItB.The oneC.The followingD.One8.The climate here is quite different from____ of Shengyang.A.thatB.itC.oneD.the one9.The study of idioms is as important as____ of grammar.A.oneB.that B.it D.this10.My seat is next to_____ of my teacher.A.thatB.itC.thisD.one二、it的用法1、it指代上文所提事物的本身(it表时间、强调等的用法此处不阐明)，如果所代替的事物为复数，则应该用they或them表示。
高考英语ONE,THAT,IT,THE ONE用法区别及习题附答案
1.it／one ／that三者均可用作代词指代前面提到的名词。
一般说来 it指代同名同物; one与that则指代同名异物。
I have lost my umbrella; I’m looking for it. （该句中it就是指前面的my umbrella）I have lost my umbrella; I think I must buy one. （one在该句中表泛指因为my umbrella已经丢了）The umbrella you bought is cheaper than that I bought. （替代词that在该句中特指“the umbrella I bought” 以区别“the umbrella you bought”）2.one与that虽可用来指代同名异物但one为泛指相当于a／an＋名词; that为特指相当于the ＋名词。
所以one所指代的名词的修饰语一般为 a／an ／some ／any; that所指代的名词的修饰语往往是the ／this ／that。
A chair made of steel is stronger than one made of wood. （该句中one可以换成a chair）The water in the cup is hotter than that in the pot. （该句中that可以换成 the water）3.one只能代替可数名词单数代替可数名词复数时用ones; that既可以代替不可数名词也可以代替可数名词单数代替可数名词复数时用 those。
I like this pen more than that one. （one代替可数名词单数pen）There were a few young people and some older ones in the house. （ones代替可数名词复数people）Mary’s handwriting is far better than that of Peter. （that代替不可数名词 handwriting）These pictures are more beautiful than those. （those代替可数名词复数 pictures）4.one既可代替事物也可代替人 that只能代替事物而不能代替人。
one,ones,that,those,it,this,that区别
those The windows of your flat are cleaner than_____of mine. A grandparent‟s job is easier than_____of a parent. that
The computers in our school are connected to the Internet while_______in their school aren‟t. those
1. I prefer red roses to white ones
. one madeke made of wheat is cheaper than rice. 3.The cost of wheat is less than that
4.The houses of the rich are generally larger than those(=the houses) of the poor.
5.The population of China is much larger than that(=the population)of Japan. 6.The students in our class are much cleverer than those(=the students)
in their class.
that/ those用于替换有定冠词的名词；one/ones用 于替换有不定冠词的名词。
Eg: The style of the building is similar to
_________of a temple. that A CD player made in Japan costs more than ________made in China. one
one,the one,that ,it的区别
One, the one, ones, the ones, that, those与it的指代用法近年来在高考中既是重点也是难点，区分度较高，同学们解答此类试题，要区分空格处是特指还是泛指，是单数还是复数，现将它们区别如下：①one指代上文提到的单数人的人或物，指“同一类中的一个”，表示泛指意义：即：a/an十单数可数名词。
The population problem may be the greatest one of the world today.（one=a problem）The editor-in-chief asked me to write another article for them, one about how to prevent bird flu.（one=an article）②the one 指代上文的单数可数名词，可以用形容词放在one之前修饰，one后也可以接后置定语修饰，专指“同类的那/这一个。
”表示特指的含义。
即the+单数可数名词。
The film is not as good as the one I saw yesterday.（the one=the film）Is this school the one you visited last year?（the one=the school）③ones指上文提到的复数的人或物，表示“同类中的许多”，表示泛指意义。
These apple are bigger than those ones.（ones=apples）These shoes are too small.Please get met some larger ones.(ones=shoes)④the ones指上文的复数可数名词，ones之前可以有形容词修饰。
也可以用后置定语修饰，专指“同类中的那/这一些”。
表示特指，即the+可数名词复数。
替代词one, ones, that, those, it, this, that讲解
That/ those不带前置定语，但必须有后置定语。 one/ones都可。当替换词的后置定语用所有格的of 短语或当替换词被所有格修饰时，不用one/onI like the vase better than ________________in the one / that another shop. The windows of your flat are cleaner than those _________of mine. A grandparent’s job is easier than ________of a that parent. The computers in our school are connected to the Internet while __________ in their school aren’t. those
one，that 和it比较
one 泛指=a+n. , that和it 表示特指。 that (指代可数名词)=the+n.与所指名词为同类， 但不是同一物。 it 与所指名词为同一物。 I can’t find my hat. I think I must buy one. (泛指) The hat you bought is bigger than that I bought. (同类但不同个) I can‘t find my hat. I don’ t know where I put it. ( 同一物)
That/ those用于替换有定冠词的名词；one/ones用 于替换有不定冠词的名词。
eg: The style of the building is similar to that _________of a temple. A CD player made in Japan costs more than one ________made in China.
it,one,ones,that,those的区别用法
it,one,ones,that,those的区别⽤法为使表达简洁明了，我们常⽤ it， one， ones， that， those 等替代词来替代前⾯已经出现的名词。
从近⼏年的⾼考英语情况来看，考查替代词的⽤法和区别⼀直是⼀个热点。
本⽂拟就以上⼏个最重要的替代词的⽤法作⼀⼩结，同时为同学们归纳⼀些使⽤技巧，希望对⼤家有所帮助。
⼀、替代表泛指的单数名词 替代表泛指的单数名词，通常⽤ one。
如： Two heads are better than one. 两⼈智慧胜⼀⼈。
I lost my old camera; this is a new one. 我的旧相机丢了，这是⼀架新的。
Did you get a ticket?—Yes， I managed to get one. 你搞到票了吗?——是的，我设法搞到了⼀张。
注：若 one 前没有形容词的修饰，则其前不能有不定冠词。
⽐较： I’m looking for a flat. I’d like a small one with a garden. 我正在找⼀套公寓，想找⼀套⼩的带花园的。
I’m looking for a flat. I’d like one with a garden. 我正在找⼀套公寓，想找⼀套带花园的。
（不能说：... a one with a garden.） 没有形容词修饰的 one 前不能⽤不定冠词，但可⽤ another。
如： This pen doesn’t work. I must buy another one. 这⽀钢笔坏了，我要另买⼀⽀了。
另外，注意它与表特指的 it 的区别。
如： Can you lend me a pen?—Sorry. I haven’t got one. 你能借给我⼀⽀钢笔吗?——对不起，我没有钢笔。
Can I borrow your pen?—Sorry， I’m using it. 我能借⽤你的钢笔吗?——对不起，我⾃⼰正在⽤。
代词it, one, ones, that, those的用法和区别
v1.0 可编辑可修改代词it, one, ones, that, those的用法和区别C-代词it, one, ones, that, those的用法和区别知识梳理一.it，one和that的用法概述代替前面的事物本身。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为they/ them.没有增加语义，所以不能带有任何定语。
2. one可以代替与前面同类不同一的事物；可以代替某类事物中的任何一个；可以做同位语，重复指代前面的事物，其后有定语从句用以进一步说明前面的名词。
one表泛指，相当于a/an+名词。
one只能代替可数名词，其复数形式是ones。
one可以根据语义在它的前面或后面加上一些定语。
one前面不能直接加不定冠词（a / an）或物主代词，one前已经有形容词时，则可以加不定冠词或物主代词；one前加the与否，取决于是否特指，如果特指就加the。
one既可以代指物，也可以代指人。
3. that代替与前面同类不同一的事物。
that表特指，相当于the+名词。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为those。
that可以根据语义在它的后面加上一些定语，多数是of短语；它的前面不能存在任何定语。
that只能代指物。
二.it, one, ones, that, those的区别：⑴.替代泛指的单数名词，通常用one。
替代泛指的复数名词，通常用ones。
如：I lost my old camera; this is a new one. 我的旧相机丢了，这是一个新的。
Did you get a ticket Yes，I managed to get one.你弄到票了吗是的，我设法弄到了一张。
Green apples often taste better than red ones. 青苹果往往比红苹果好吃。
⑵.替代特指的单数名词，可用 it， that， the one。
代词it、one、that的用法
代词that, one, the one, it的用法区别它们三词均作代词用，指代前文提到的名词。
但是it所指是同名同物，one和that所指是同名异物①that是特指，代替前面提到的不可数名词或单数可数名词。
代指前面提及的同类而非同一物，其复数用those，后面一般有后置定语。
The weather in Kunming is better than that in Wuhan.The population of China is larger than that of any other country in theworld.②one是泛指，指代前面提到的同类人或物（可数名词）中的一个，其复数用ones，前面一般有定语。
I bought five pencils for my children, two red ones and three green ones.③ the one 是特指，指代前面提到的同类人或物（可数名词）中的一个，其复数用the ones。
This picture is the one that I drew yesterday.④ it是特指，代替前面提到的那个特定的事物。
I lost my dictionary yesterday. I haven't find it so far.一、it的用法1、it指代上文所提事物的本身（it表时间、强调等的用法此处不阐明），如果所代替的事物为复数，则应该用they或them表示。
2、it也可以用来代替上文所提到的一件事。
1.The Parkers bought anew house but _____ will need a lot of work before they can movein. (NMET2001,25)A.theyB.itC.oneD.which2.I am looking for a house. I’d like ____ with a brook around_____.A.one,itB.it,itC.one,oneD.it,one3.Mary’s mother always told her to work hard,but______didn’t help.A.oneB.heC.sheD.it4.—Doyoulikethesephotos?—Yes,____areverybeautifulandIlike____verymuch.A.they,those B.they,themC.ones,onesD.the ones, the ones5.—Are you still using your old car? --No, I sold___the other day.A.itB.oneC.that oneD.the one6.Yesterday I lost my pen, but now I have found_____.A.itB.themC.onesD.those7.—Where are my books? --_____ are on the TV set.A.OnesB.ThoseC.The onesD.They8.Where have you put my shoes? I can’t find_____anywhere.A.themB.thoseC.onesD.the ones9.Where did you buy the watch? Would you please get____ for me?A.itB.oneC.the oneD.them10.Don’t read in the sun. ____ is bad for your eyes.A.OneB.The oneC.ItD.This二、that的用法1、that用来指前文中确定的非同一事物，常用来替代与定冠词或形容词性物主代词连用的单数可数名词或不可数名词，相当于“the+名词”，其复数形式为those。
it,that,those,one的区别doc
it、that、those、one、the one、ones及the ones的用法辨析1.it的用法：1)、指代上文提到的单数可数名词，指同一物，即原物（同类同物）。
例：The printer is made in Japan. It was bought last year.2)、指时间、距离、天气、环境。
3)、代替前面出现的整个句子的内容，常作宾语。
4)、固定句型：appreciate it if；hate(like/dislike/love) it when；depend on(rely on/see to) it +that 等从句。
5)、固定搭配：get it 懂了，知道了，理解了；take it 买某物 make it 成功做某事 it doesn’t help 不起作用6)、作形式主语或形式宾语。
如：make/find it+(a) 名词/形容词to do/doing sth7)、指代不明确的人。
8)、动物或婴儿（未知性别的婴儿和孩子）。
练习：1). We should make ____a rule for us roommates to turn off the lights at 10:00 pm.A. allB. oneC. thatD. it2). I hate ____when people talk with their mouths full.A. themB. oneC. thatD. it3). How do you find ____to learn English?A. thatB. thisC. /D. it4). In order to keep our class room clean, we make ____ everyone’s duty to clean the classroom in turn.A. whichB. oneC. thatD. it5). ---Who knocked at the door?---I’ve no idea. I just pretended nobody was at home, so I didn’t ask who ___was.A. heB. sheC. thatD. it2. that的用法：1)、特指，替代前面出现的同类名词，但不是同一个物体（同类异物）。
it、one、that的用法与区别
8. Of all my old friends, the only _____ I saw much of was Betty. A. it B. that C. one D. this
再见
• A chair made of steel is stronger than one made of wood. （该句中one可以换成 a chair）
• The water in the cup is hotter than that in the pot. （该句中that可以换成 the water）
6. I took _____ for granted （conj.假定;就算 ） that you
would stay with us. A. it B. that C. res can equal _____ of a cool drink on a hot
• He advised the farmers to choose the best seed-heads, the ones ／those that had the best color. （该句中the ones代替事物, 并且也 可以用those）
• V. one一般有前置修饰语, 有时也可有后 置修饰语或不用修饰语。而 that不能有 前置修饰语, 但可有后置修饰语。
4. I haven't a pen. Can you lend me_____? A. these B. those C. them D. one
5. _____ is necessary that I get the text of my revision
初中英语九年级 it, one, that的区别
初三英语每日一练——— it, one,和that的区分【考点分析】代词是代替名词或一句话的一种词类，为了避免重复出现前面已经出现的名词，初中阶段常用it, one, that来替代。
代词在中考中也是非常重要的语法点之一。
【典型例题】1.--- Have you found your lost mobile phone?--- No, I haven’t found ______, but I bought ______ this morning.A.it; thatB.that; oneC.it; oneD.one; it【易错点】1.无法判断代词指代对象；2.无法判断泛指、特指。
【解题方法】1）观察选项：考查代词it, one,和that的区别，总结表格如下：2）结合句意，分析指代对象：“I haven’t found ______”句意：我找不到我的手机了。
横线处代词指代上文出现的your lost mobile phone你丢了的手机，同类且同物，所以用It.“but I bought ______ this morning.”句意：但是我今天早上买了一个新手机。
横线处代词指代a new mobile phine一个新手机，同类而不同物，泛指一个手机，所以用one.综合分析本题选C【练习巩固】1.--- A latest China Daily, please!--- Oh, only one copy left. Would you like to have ______? (2014鼓楼9A期末)A.oneB.itC.thisD.that2.I’m expecting a pet cat for long, but my dad has no time to buy ______ for me. (2017合肥9B二模)A.itB.oneC.thisD.that3.--- Is this iPad yours?--- Yes. My parents bought ______ for my English learning. (2017合肥9A月考)A.oneB.itC.otherD.another4.The color of his trousers is different from ______ of yours.A.oneB.onesC.itD.that5.--- I can’t find my raincoat. I hung it behind the door.--- I saw Peter going away with ______, but I’m not sure if it’s yours.A.oneB.thatC.itD.some【答案解析】1.【答案】B1）观察选项：考查代词it, one,和that的区别。
代词it,one,ones,that,those的用法和区别
代词it, one, ones, that, those的用法和区别C-代词it, one, ones, that, those的用法和区别知识梳理一.it，one和that的用法概述代替前面的事物本身。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为they/ them.没有增加语义，所以不能带有任何定语。
2. one可以代替与前面同类不同一的事物；可以代替某类事物中的任何一个；可以做同位语，重复指代前面的事物，其后有定语从句用以进一步说明前面的名词。
one表泛指，相当于a/an+名词。
one只能代替可数名词，其复数形式是ones。
one可以根据语义在它的前面或后面加上一些定语。
one前面不能直接加不定冠词（a / an）或物主代词，one前已经有形容词时，则可以加不定冠词或物主代词；one前加the与否，取决于是否特指，如果特指就加the。
one既可以代指物，也可以代指人。
3. that代替与前面同类不同一的事物。
that表特指，相当于the+名词。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为those。
that可以根据语义在它的后面加上一些定语，多数是of短语；它的前面不能存在任何定语。
that只能代指物。
二.it, one, ones, that, those的区别：⑴.替代泛指的单数名词，通常用one。
替代泛指的复数名词，通常用ones。
如：I lost my old camera; this is a new one. 我的旧相机丢了，这是一个新的。
Did you get a ticket? Yes，I managed to get one.你弄到票了吗?是的，我设法弄到了一张。
Green apples often taste better than red ones. 青苹果往往比红苹果好吃。
⑵.替代特指的单数名词，可用 it， that， the one。
it that one 区别
如何区别it，one和that？I like this house with a beautiful garden in front, but I don’t have enough money to buy ______.A. oneB. itC. thisD. that答案：B一、it代替前面的事物本身。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为they/ them. 没有增加语义，所以不能带有任何定语。
二、one可以代替与前面同类不同一的事物；可以代替某类事物中的任何一个；可以做同位语，重复指代前面的事物，其后有定语从句用以进一步说明前面的名词。
one表泛指，相当于a/an+名词。
one只能代替可数名词，其复数形式是ones。
one可以根据语义在它的前面或后面加上一些定语。
one前面不能直接加不定冠词（a / an）或物主代词，one前已经有形容词时，则可以加不定冠词或物主代词；one前加the与否，取决于是否特指，如果特指就加the。
one既可以代指物，也可以代指人。
三、that代替与前面同类不同一的事物。
that表特指，相当于the+名词。
它可以代替可数名词，也可以代替不可数名词。
代替可数名词时，复数形式为those。
that可以根据语义在它的后面加上一些定语，多数是of短语；它的前面不能存在任何定语。
that只能代指物。
I have lost my umbrella; I'm looking for it. （该句中it就是指前面的my umbrella）I have lost my umbrella; I think I must buy one. （one在该句中表泛指，因为my umbrella 已经丢了）The umbrella you bought is cheaper than that I bought. （替代词that在该句中特指“the umbrella I bought”，以区别“the umbrella you bought”）A chair made of steel is stronger than one made of wood. （该句中one可以换成a chair）The water in the cup is hotter than that in the pot. （该句中that可以换成 the water）I like this pen more than that one. （one代替可数名词单数pen）There were a few young people and some older ones in the house. （ones代替可数名词复数people）Mary's handwriting is far better than that of Peter. （that代替不可数名词 handwriting）These pictures are more beautiful than those. （those代替可数名词复数 pictures）The one ／That on the table is mine. （该句中The one代替事物，并且也可以用That）He is the teacher, the one who is loved by the students. （该句中the one代替人，不能用that）He advised the farmers to choose the best seed-heads, the ones ／those that had the best color. （该句中the ones代替事物，并且也可以用those）Cook was a strict but good captain, one who took good care of his sailors.The water in the well is cleaner than that in the river.1. I prefer a flat in Inverness to___ in Paris, because I want to live near my Mom's. (200 5江苏)A. oneB. thatC. itD. this2. We've been looking at houses but haven't found___ we like yet. (2005浙江)A. oneB. onesC. itD. them3． We needed a new cupboard for the kitchen. So Peter made___ from some wood we had. (2004全国III)A. itB. oneC. himselfD. another4. ---Why don't we take a little break?---Didn't we just have___? (2000全国)A. itB. thatC. oneD. this5. Cars do cause us some health problems--- in fact far more serious___ than mobile pho nes do. (2005江西)A. oneB. onesC. itD. those6. Mr. Zhang gave the books to the pupils except___ who had already taken them. (MET 1992)A. the onesB. onesC. someD. the others。
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高考中常常考查one和that作为普通代词的区别，还常与it进行区别。
主要用法如下：
it／one ／that三者均可用作代词, 指代前面提到的名词。
一般说来, it指代同名同物; one与that则指代同名异物。
I have lost my umbrella; I'm looking for it. （该句中it就是指前面的my umbrella）
I have lost my umbrella; I think I must buy one. （one在该句中表泛指, 因为my umbrella已经丢了）
The umbrella you bought is cheaper than that I bought. （替代词that在该句中特指“the umbrella I bought”, 以区别“the umbrella you bought”）
II. one与that虽可用来指代同名异物, 但one为泛指, 相当于a／an＋名词; that为特指, 相当于the ＋名词。
所以one所指代的名词的修饰语一般为a／an ／some ／any; that所指代的名词的修饰语往往是the ／this ／that。
A chair made of steel is stronger than one made of wood. （该句中one可以换成a chair）
The water in the cup is hotter than that in the pot. （该句中that可以换成the water）
III. one只能代替可数名词单数, 代替可数名词复数时用ones; that既可以代替不可数名词也可以代替可数名词单数, 代替可数名词复数时用those。
I like this pen more than that one. （one代替可数名词单数pen）
There were a few young people and some older ones in the house. （ones代替可数名词复数people）
Mary's handwriting is far better than that of Peter. （that代替不可数名词handwriting）These pictures are more beautiful than those. （those代替可数名词复数pictures）
IV. one既可代替事物, 也可代替人, that只能代替事物而不能代替人。
有时可以用the one或the ones代替that或those。
The one ／That on the table is mine. （该句中The one代替事物, 并且也可以用That）
He is the teacher, the one who is loved by the students. （该句中the one代替人, 不能用that）He advised the farmers to choose the best seed-heads, the ones ／those that had the best color. （该句中the ones代替事物, 并且也可以用those）
V. one一般有前置修饰语, 有时也可有后置修饰语或不用修饰语。
而that不能有前置修饰语, 但可有后置修饰语。
Cook was a strict but good captain, one who took good care of his sailors.
The water in the well is cleaner than that in the river.
VI. it可以替代句中的不定式或从句等, 充当形式主语或形式宾语。
one与that均无此用法。
It is known to everybody that the moon travels around the earth once every month.
I found it hard to get on with her.
VII. it与that均可以替代上文全句的内容或部分内容, 而one ／ones则不可以。
He has saved my life; I'll never forget it. （it代替第一分句）
Tom is painting his house. I am told he does it every four years. （it代替前面分句的部分内容painting his house）
Let's say we meet here at three o'clock. That ought to give you time to buy everything. （That代替前面表述的内容。