Can + bare infinitive
Incorrect: He can to swim very well.
Correct : He can swim very well.
Incorrect : She can not to dance well.
Correct : She cannot dance well.
Note: A modal is usually followed by a bare infinitive (an infinitive without "to"). The negative form of "can" is "cannot'’ which is always written as a single word. Most modals are followed by a bare infinitive. For example:
I could not go there yesterday.
May I come in?
He might go there tomorrow.
I shall/will help you.
You should obey your parents.
It must rain to-night.
Only "ought” and “used” are followed by a to-infinitive. For example:
You ought to obey your teachers.
He used to help me every now and then.
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