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Use of the infinitive

Feel + infinitive without to.
Don’t say:    I could feel her heart to beat.
Say:   I could feel her heart beat.
Or: I could feel her heart beating.
Note: If the verbs make, see, watch, hear, feel, are used in the passive, to must be used: He was seen to leave the house: He was heard to speak in English.

Hear + infinitive without
Don’t say:    We heard him to speak in English.
Say:   We heard him speak in English.
Note: We heard him speaking in English is also correct.

Watch + infinitive without  to.
Don’t say:    I watched the girls to play hockey.
Say:   I watched the girls play hockey.
Note: I watched the girls playing hockey is also correct.

See + infinitive without to.
Don’t say:    They saw him to leave the house.
Say:  They saw him leave the house.
Note: They saw him leaving the house is also correct.

Make (to force) + infinitive without to.
Don’t say:    You  can’t make Emma to understand.
 Say:   You can’t  make Emma understand.

Let + infinitive without to.
Don’t say:   Tom’s  father  would  not  let  him  to  go  out.
Say:   Tom’s father would not let him go out.

Must + infinitive without to.
Don’t say:     I  must to  see her  at her office.
Say:   I  must  see  her  at  her office.

Might + infinitive without to.
Don’t say:    He might to come in the morning.
Say:   He might come in the morning.

 May + infinitive without to.
Don’t say:    May I to visit you next weekend?
Say:    May I visit you next weekend?

Could + infinitive without  to.
Don’t say:     I could not to see you yesterday.
Say:   I  could not couldn’t see you  yesterday.

Can + infinitive without to.
Don’t say:     My mother can  to  swim  very well.
Say:   My mother can swim very well.
Note: Always write the negative form cannot as one word. Alternatively, the short form can’t can be used informally.