Cho mik câu trả lời hay nhất nha <3

) Keep silent or you'll wake the baby up.
-> If you don't keep silent, you'll wake the baby up.
2) Because you don't leave immediately, I call a policeman. 
-> If you leave immediately, I won't call a policeman.
3) I don't know the number, so I don't ring her up.
-> If I knew the phone number, I would ring her up.
4) Go right now or you'll be late for the train.
-> If you don't go right now, you'll be late for the train.
5) As she is often absent from class she can't keep pace with her classmate.
-> If she weren't often absent from class, she could keep pace with her classmate.
6) I couldn't write to Alice beacuse I did't know her address
-> If I had known Alice's address, I could have written to her.