Infinitiv je osnovni oblik glagola (to speak, to help, to understand…) Kada se koristi bez to, naziva se krnji infinitive (Help me close the window.) Oblici infinitiva sa i bez to se koriste u engleskom za građenje vremena, u indirektnom govoru, ali infintivi mogu imati i sledeće uloge:

She came to take her passport. (namera)

To visit Paris is my life-long dream. (subjekat)

We didn’t know what to do. (infinitiv sa upitnim rečima)

Vrste infinitiva

Postoji nekoliko oblika infinitiva u engleskom jeziku.

1) Negative infinitive: 

not + to + verb

Try not to be late tonight.

2) Progressive infinitive:

to + be + verb + -ing

He seemed to be waiting here for two hours.

3) Perfect infinitives:

a) to + have + past participle

She was sorry to have forgotten about their anniversary.

b) to + have + been + verb + -ing

I seem to have been looking for my keys for hours.

4) Passive infinitive:

to + be + past participle

He didn't expect to be sued.

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