To see, to feel, to watch, to observe

* I felt my heart jump.

* I never saw you look so before.

4. after the verb to make in the meaning of “заставлять “ and the verb

to have in the meaning of “заставлять, велеть“:

* What makes you think so?

* I had them take my luggage.

5. after the verb to let:

* Let us be the best friends in the world.

6. after the expressions:

Had better, would rather, would sooner, cannot but, nothing but

* You` d better go to bed.

* I would rather not speak upon this subject.

* I would sooner die than marry such a person.

* I cannot but think so.

* There was nothing left for him to do but watch and wait.

7. in questions of special type (infinitive sentences beginning with “why“)

* Why not go to the Zoo?

V. Particle «to» instead of the Infinitive

1. Particle «to» may be used so that to avoid the whole infinitive construction.

* I went there because I wanted to (= because I wanted to go there). –

Я пошел туда потому, что мне так хотелось.

2. Particle «to» may be omitted after nouns, adjectives and some verbs.

* He`ll never leave home: he hasn`t got the courage (to). –

Он никогда не уедет из дома: у него не хватит смелости (сделать это).

* I think he should get a job, but you can`t force him to if he isn`t ready (to). – Я думаю, что ему следует взяться за работу, но его никто не сможет заставить это сделать, если он не готов к этому.

* - Can you drive the car? – Ты умеешь водить машину?

- O.K., I`ll try. – О.к. Я постараюсь.

3. Particle «to» can`t be omitted after want and would like:

* -Are you interested in entering the University? – Ты заинтересован в том, чтобы поступить в университет?

- Yes, I`d like to (Not: I would like). – Да, мне бы этого хотелось.

But: Particle «to» is often omitted after want and would like in subordinate clauses:

* Come when you want. – Приходи, когда захочешь.

* I`ve decided to do what I like. – Я решил делать, что мне хочется.

VI. Split Infinitive

Split Infinitive – is the construction where an adverb is used between the particle «to» and the verb.

* He began to slowly get up off the floor. – Он начал медленно вставать с пола.

The Functions of the Infinitive in the Sentence

The Subject

1.

to do sth is (was, will be) necessary

would be impossible

means (meant) a mistake

to do smth

* To get angry was stupid.

* To translate the article was a difficult task.

2.

The infinitive is used as the subject when the sentence opens with the introductory it which serves as introductory subject.

necessary

is important to do smth

it was interesting to be done

will be easy to be doing smth

simple

nice

* It is useless to discuss this question.