Viết lại câu: He plays the guitar better than I do. How long have you been learning English?

1.He plays the guitar better than I do.
=>I don't
2.How long have you been learning English?
=>When
3.She didn't realize it was valuable. She gave it away.
=>If
4.Unfortunately I've got to work late tonight.
=>I wish
5.Don't forget to contact me if you come to Vietnam.(keep)
=>Don't forget