return 归还
borrow 借
一般只要句子上的意思符合便能用了.
不过if的状语从句必须用 主将从现,就是:
If you borrow books,you will have to return the books on time
然后you can borrow books ,you have to return books on time.
这句话应该是前后关联的,那么要改为:
You can borrow books,but you have to return the books on time.