can, cannot, can't
The modal auxiliary can and the negative forms cannot, can't
The auxialiary/modal can has the same form regardless the subject. There is no -s in the 3rd person singular.
The auxialiary/modal can is used with a main verb in its infinitive. It can be used alone in short answers.
There is no contracted form of can in affirmative sentences.
Affirmative sentences | Negative sentences | ||
---|---|---|---|
long form | contracted form | long form | contracted form |
I can sing. | --- | I cannot sing. | I can't sing. |
You can sing. | --- | You cannot sing. | You can't sing. |
He can sing. | --- | He cannot sing. | He can't sing. |
She can sing. | --- | She cannot sing. | She can't sing. |
It can sing. | --- | It cannot sing. | It can't sing. |
We can sing. | --- | We cannot sing. | We can't sing. |
You can sing. | --- | You cannot sing. | You can't sing. |
They can sing. | --- | They cannot sing. | They can't sing. |