I have question about present prefect.

Hi,

Neil can't .. tennis. He's broken his arm.

a.to play
b.playing
c.play

What is the correct answer?

C. With 'can', you need the base form of the verb.

eg We say 'I can speak English', but not 'I can speaking English'.

Best wishes, Clive

Hi,

I was speaking of the type of sentence you gave us.

You can say 'can' with other tenses, eg He can have cooked dinner. eg He can be cooking dinner.

Try to write a few more sentences, and I'll comment on them for you.

Clive

«That's mean always i have "can" in the sentence after it will come "verb with base form without matter which time is it ?"»

If you want to put it into another tense, that should be encoded in the form of "can":
«When I was young I could type 300 symbols per second», "type" is in the base form.

Rotter:
  Are your joking by pointing out the least serious  mistake  in
  the sentence?

BeginStudent:
  That sentence is not very correct, and we'll be glad  to  help
  you imrove it if you have no ideas of what can be  wrong  with
  it ;)