can /can't, could /couldn't

She ________ cook really well. Her food is always great.

Correct the mistake: I don't can play the guitar.

Correct the mistake: A: Does he can cook? B: Yes, he can.

Correct the mistake: A: Could he walk before his accident? B: Yes, he did.

Correct the mistake: I didn't could understand what he said.

Correct the mistake: I could ran very fast when I was a child.

My husband ______________ speak French, Spanish and Portuguese. It's useful when we travel!

Correct the mistake: She cans speak four languages.

He isn't on the football team, because he _________ run very fast.

I _________ climb trees when I was a child but I'm too old now.

I __________ play the guitar. I want to learn the drums next.

When I was at school, I ________ do maths. But now I'm much better.

I __________ drive last year but I passed my test six weeks ago!

Correct the mistake: How fast you can swim?