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An infinitive is the "to + verb" form of a verb.

I like to sing.

An infinitive can be used:

  • as the object of a verb.

  • as the subject of a clause.

  • to express "purpose".

  • after certain adjectives. For example: glad to, happy to, afraid to, lucky to.

  • after certain verbs or verb + noun/pronoun combinations. For example: expect, hope, plan, decide, promise, tell someone to, remind someone to, force someone to, need someone to, want someone to, etc.

  • after certain expressions, for example: too, enough.

  • in the simple form ( without "to") with certain verbs. For example: see, feel, make, have, let, etc.

  • can express the negative, when "not" is placed before it in the past and passive forms.

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