Exercício: Can and Could

Hi there!

I'm an English teacher for beginners and I need a good exercise about can and could. Could somebody could help me with it?

I'll apreciate all your help and thanks a lot!

Aline,
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Put the sentences into the negative and interrogative forms

A) I can sing.
N-
I-

B) He could go.
N-
I-

C) We can cook.
N-
I-

D) She can speak English.
N-
I-

E) You could win.
N-
I-

Bons estudos.
Thanks a lot!
I can't sing
Can I sing?
He could go
He could not sing
Could He sing?
We can Cook
We can't Cook
Can we Cook?
She can speak English
She can't speak English
Can She speak English?
You could Win
You couldn't Win
Could You Win?
Put the sentences into the negative and interrogative forms

A) I can sing.
N-I can't sing.
I- Can I sing ?

B) He could go.
N- He couldn't go
I- Could he go ?

C) We can cook.
N- We can't cook
I- Can't we cook ?

D) She can speak English.
N- She can't speak English
I- Can she speak English ?

E) You could win
N- You couldn't win.
I- Couldn't you win ?