Affirmative I/you/he/she/it/we/you/
they can sing.

Negative

I/you/he/she/it/we/you/ they cannot/can't sing.

Interrogative

Can I/you/he/she/it/we/you/they sing?

Short answers

1) Yes, I/you/he/she/it/we/you/they can.

2) No, I/you/he/she/it/we/you/they can't.
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I've never go home!I've just wanted to make a joke...Have you ever visit Russia?I already have known this factI have never seen this...He has just say "bye!"I have never liked thisHas he ever meet her?Clara hasn't done her homework yet I have just watched a great film on TV

Это был Present Perfect

I never liked him until I have seen himI thought that boys never brush teethI just wanted to stay aloneI known that you ever say me "bye"He never liked me...I'am just bored...And you said only "I'm just wanted to sleep"?!I just ate them!I never saw you in this dress...Why I was "just good friend" for you?!

Это был Past Simple

2) Why are you so disappointed? – Because I had hoped that I would pass the test, but I didn’t.3) Have you found your bag yet? – No, but I ..had. reported it stolen to the police yesterday.
4) Did you enjoy the play last night? – No, even though I ..had read good reviews of it before I bought the tickets.
5) Have you written your report yet? – I had just started when you came in, actually.
6) Sorry I’m late. – Where have you been? Ihad expected you an hour ago.

7) We (go) to an antique market yesterday. – (you/buy) anything?

8) Were you surprised that the factory closed down? – Nto really. In fact, I (know) it was going to happen.

9) Julia did well in the test, didn’t she? – Yes. She (study) very hard for it.