Решение:
- My sister can't catch a ball. (-)
- Can you run ten kilometres?
- All my friends can play basketball. (+)
- Can your mom speak Japanese?
- Maria can't do her maths homework. (-)
- I can make great cakes. (+)
Ответ: 1. can't catch; 2. Can you run; 3. can play; 4. Can your mom speak; 5. can't do; 6. can make.