Can

The point

Can is a modal. The next verb is the base. No to, and no -s. The negative is cannot or can't. The question is Can plus the subject.

Form and use

Can keeps one form with every subject. It can mean ability: She can swim. It can mean permission: You can park here. The situation shows which meaning you want. Can does not take -s, and the next verb does not take to. There is no cans and no can to.

The base verb follows can for every person. I can drive. You can drive. He can drive. She can drive. It can wait. We can drive. They can drive. She can to drive is wrong because of to. She cans drive is wrong because of -s on can. She can drives is wrong because of -s on the main verb. One form of can, then the base.

The negative is cannot, one word, or the short form can't. I cannot drive. She can't see the board. They cannot leave yet. Doesn't can is not a form. Cannot already carries the negative, so do not add do or does. In careful writing, cannot is the full single word. Can't is the everyday short form.

A question moves can in front of the subject. The main verb stays the base. Can you drive? Can she leave now? Can they help? A short answer uses can, not do. Yes, I can. No, I can't. Yes, she can. No, she cannot. Yes, they can. No, they can't. Yes, I do does not answer Can you drive? The helper in the question is the helper in the answer.

Don't translate it like this

Can does not take to.

Short examples