a. 2. He can drive a car.

3. They can't cook.

4. She can do ballet.

5. She can't speak Chinese.

b.1. Can you play the guitar? No, I can't.

2. Can you drive a car? No, I can't.

3. Can you cook? Yes, I can.

4. Can you do ballet? No, I can't.

5. Can you speak Chinese? No, I can't.