关于unless的英语题~

问题描述:

关于unless的英语题~
用unless改写句子
1.If you do not oil the motor regularly,it won't run smoothly.
2.If the weather doesn't change,we won't be able to reach the top of the mountain.
3.We can't write to Mr.White if he doesn't send us his address.
4.You will get a good grade if you do your homework.
5.They couldn't afford to live in such an expensive apartment if they were not rich.

1.Unless you oil the motor regularly,it won't run smoothly.
2.Unless the weather changes,we won't be able to reach the top of the mountain.
3.We can't write to Mr.White unless he sends us his address.
4.You won't get a good grade unless you do your homework.
5.They couldn't afford to live in such an expensive apartment unless they were rich.