For example:

Infinitives may occur with or without the infinitive marker "to". Infinitives without "to" are known as "bare infinitives".

For example:

OTHER FORMS
The infinitive can have the following forms:

1. The perfect infinitive
   to have + past participle
   
   For example: to have broken, to have seen, to have saved.
   This form is most commonly found in Type 3 conditional sentences, using the conditional perfect.
   
   For example:
   • If I had known you were coming I would have baked a cake.
   • Someone must have broken the window and climbed in.
   • I would like to have seen the Taj Mahal when I was in India.
   • He pretended to have seen the film.
   • If I'd seen the ball I would have caught it.


2. The continuous infinitive
   to be + present participle
   
   For example: to be swimming, to be joking, to be waiting
   
   Examples:
   
   • I'd really like to be swimming in a nice cool pool right now.
   • You must be joking!
   • I happened to be waiting for the bus when the accident happened.


3. The perfect continuous infinitive
   to have been + present participle
   
   Examples: to have been crying, to have been waiting, to have been painting
   
   Examples:
   
   • The woman seemed to have been crying.
   • You must have been waiting for hours!
   • He pretended to have been painting all day.


4. The passive infinitive
   to be + past participle
   
   For example: to be given, to be shut, to be opened
   
   Examples:
   
   • I am expecting to be given a pay-rise next month.
   • These doors should be shut.
   • This window ought to be opened.

NOTE: As with the present infinitive, there are situations where the "to" is omitted.

• He claimed to be an expert.
• I managed to reach the top of the hill.
• Don't pretend that you know the answer.
• She failed to explain the problem clearly.
• The customs man demanded to search our luggage.
• I can't afford to go out tonight.

» Verbs
» Finite Verb
» Gerund

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