CAN
AFFIRMATIVE:
(SINGULAR:)
I can
You can
He / she / it can
(PLURAL:)
We can
You can
They can
Example: I can eat four apples a day.
NEGATIVE:
(Short form)
(SINGULAR:)
I can't
You can't
He / she / it can't
(PLURAL:)
We can't
You can't
They can't
Example: I can't drink milk.
(Long form)
(SINGULAR:)
I cannot
You cannot
He / she / it cannot
(PLURAL:)
We cannot
You cannot
They cannot
Example: I cannot go to your house.
INTERROGATIVE:
(SINGULAR:)
Can I? -----> SHORT ANSWERS: Affirmative: Yes, you can. Negative: No, you can't.
Can you? -----> SHORT ANSWERS: Affirmative: Yes, you can. Negative: No, you can't.
Can he / she / it? -----> SHORT ANSWERS: Affirmative: Yes, he / she / it can. Negative: No, he / she / it can't.
(PLURAL:)
Can we -----> SHORT ANSWERS: Affirmative: Yes, you can. Negative: No, you can't.
Can you? -----> SHORT ANSWERS: Affirmative: Yes, we can. Negative: No, we can't.
Can they? -----> SHORT ANSWERS: Affirmative: Yes, they can. Negative: No, they can't.