The infinitive of to

The ellipsis form of infinitive symbol to is 1. After interrogative adverbs why or why not, infinitives without to are often used to form interrogative sentences. Why not try again? Why not try again?

2. Some prepositions can be followed by infinitive forms without to.

1) after "can't but ... have to".

I have to admire his courage. I have to admire this courage.

2) after "yes but", I can only lose the money ... just, it's a big deal. " I may lose that money.

3) In the structure of "doing nothing but ...", there is something to do, but (or except) ..., sb. There is something to do but ",and the preposition but (or except) is followed by an indefinite verb without to.

He did nothing but smoke at the meeting. He did nothing but smoke at the meeting.

I have nothing to do but copy this article for him.

3. The adverb in the fixed sentence structure is followed by the infinitive without to.

You'd better tell her about it. You'd better tell her about it.

2) Would rather (not) ... would rather (not); I'd rather (not) = rather (not) ... I'd rather not tell you.

This sentence pattern can also be extended to: I would rather ... than ... = will ... Lassa ... or will be faster ... than ... he would rather die than give in to the enemy.

4. In imperative mood (or spoken English), the infinitive symbol to after the verbs come, go and run can be omitted as an adverbial of purpose, which is very common in American English and its usage is also very common in imperative sentences. Go and see what happens outside. Go and see what's happening outside.

5. Generally, they are auxiliary verbs or modal verbs such as: do, will, shall, would, should, can, May, must, etc. An infinitive without a to. For example, do you remember what your tea party brought you the other day? Do you remember what your teacher told you two days ago?

6. When visual verbs see, watch, pay attention, observe, pay attention, etc. Verbs such as auditory verb hear, causative verb make, let, have, and emotional verb feel are followed by infinitives as compound objects. When infinitives without to are used as subjects to complement subjects, they should be added. In this case, the infinitive symbol to cannot be omitted. Suddenly, we felt the atmosphere became tense. Suddenly we felt the atmosphere became tense.

He was forced to do it again. He was forced to do it again.

7. Two or more infinitives with to are connected by the coordinate conjunction and or OR. When used as predicative, object or adverbial in a sentence, the second and subsequent infinitive symbols can be omitted. She told the good boy to stay there until she came back. She told the good boy to stay there until she came back.

The infinitive without to is also used in the "object+infinitive" structure after the phrase look and listen. Common in American English. She listened to the sound of rain beating on the window pane. She listened to the rain beating on the window.