Đáp án :
1. wish ⇒ wishes
2. rained ⇒rain
3. was ⇒ were
4. have ⇒ had
5. didn't rain ⇒ hadn't rained
6. gives up ⇒ would give up
7. studied⇒ had studied
8. will ⇒ would
9. stops ⇒stopped
10. are ⇒ were
11. is ⇒ was / were
12. will come ⇒ would come
13. am ⇒ was / were
14. been ⇒ be
15. wish ⇒ wishes