Can - can't rules, examples

Can - can't auxiliary verbs

Auxiliary verb can (positive) - can't (negative) use

Use can, when you ask someone to do things. Use 'can' to talk about possibility. Always use can with another verb.
I can = I know to do something. / I know that something is possible for me.
Future: Use can if you are deciding now what to do in the future.

Can - can't statements and negatives

To form the negative add "not" after can to form one word. Example: cannot. Short form: can't. (can't = cannot)

Statements Negatives

I can write a letter.
You can write a letter.
He / She can write  a letter.
We can write a letter.
You can write a letter.
They can write a letter.

 
I can't write a letter.
You can't write a letter.
He / She can't write  a letter.
We can't write a letter.
You can't write a letter.
They can't write a letter.


Questions and short answers

Questions Short answer positve Short answer negative

Can I write a letter?
Can you write a letter?
Can he / she / it  write  a letter?
Can we write a letter?
Can you write a letter?
Can they write a letter?

Yes, you can.
Yes, I can.
Yes, her can.
Yes, you can.
Yes wecan.
Yes they can.

No, you can't.
No, can't.
No, can't.
No, you can't.
No, we can't.
No, they can't.


Statement Negative
I can write a letter.
I cannot (can't)  write a letter.

Can - can't exercises

01 can - exercises
02 can grammar exercises
03 can - negative form
04 Can and can't
05 can - questions
06 'can' matching exercise
07 questions with can
08 questions with can
09 mixed exercises can
10 Can negatives and questions

Free tutorial can - can't. English can - can't exercises. English grammar easy to learn.  英语在线练习. Exercícios das aulas de Inglês grátis online, exercícios de vocabulários, gramática inglesa.