Choose the correct option:
1. Yesterday liz (couldn't/can't) barrow a book from the local library because she hadn't returned another one.
2. (Can/could) molly learn a long poem by heart when she was three?
3. When Mrs. Black was a teenager she (couldn't/can't) play the piano.
4. What (can/could) Polly do when she was seven?
5. Pam said she (couldn't/can't) learnt that because she was busy.
6. Tom says he (could/can) speak English perfectly well.