Bài 1.Đề bài : Viết lại câu vs "if / unless" sao cho nghĩa của câu không thayy đổi.
1. I can't finish this task you don't give me a hard.
2.you will run out of money if you don't stop wasting it.
3.Don't call me unless it is an emergenry.
4.James will not pass the test unless he studies harder.
5.if Jane finishes her work before 6.pm, she will dine out with her friends.
6.my brother won't go traveling this summer if he doesn't  find a companion.
7.it is not easy to do these exercises unless you listen attentively to the teacher.
8.if Jim doesn't submit his essay before Tuesday, he will be punishes by the teacher.
Bài 2.hoàn thành các câu sau use dạng đúng of động từ trg ngoặc 
1.the manager (be)_________ very angry if I am late for work.
2.you will have to work very hard if you (take) ______ this course.
3.I (go) ____ to see the doctor if i don't feel well tomorrow.
4.they can't hear you unless you (speak) ____ louder.
5.if Perter (forget) _______ to write his essay, the teacher (give) ______ him a low mark.
6. if they (win)____ this match, they will ne the champions.
7.we (have) _________ plenty of time if we (arrive)_______ there early.
8.the zookeeper (punish)_______ you if you (feed) _________ the animal.
9. what___________ (jane/say) if Jim (tell) _________ her teh truth.
10. the boys (shiver) ________ with cold if they (swim)_____ in this lake.
11.the door (not lock)________ unless you (press)______ the green button.
12Jim won't be late if he (take)___ the bus at 6 o'clock.
13.Mary isn't home, but if you(want)__________ to leave her a message, i (give)________ it to her.
14.if jack (clean)__________ the floor, i (do)______ the wasing.