不带to的动词不定式通常有下面十八种情况

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连用构成谓语动词的否定、疑问和强调形式。

(1)he does not work in the factory.

(2)Does she work here？

(3)I did not see her yesterday.

(4)Did they take you home?

(5)He does look

tired.

(6)They did come yesterday.

二、与情态动词连用构成复合谓语

(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 for me?

(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 few big 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、在表示感觉的动词如：see,,watch,hear,listen

to,feel,notice,observe,perceive(觉察，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 the

street.

(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 you

enter.

(8)He observed someone open the door.

(9)I did not perceive anyone come in.

(10)He beheld her go out.

但除notice,watch不用被动语态外，上述动词变成被动语态时，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通常不用于被动语态，make和bid可用于被动语态，let偶尔也可用于被动态，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 as

soon…as…后的动词不定一般不带to

(1)When the country calls you for help,you cannot but go.