一、用括号内所给单词的适当形式填空。
1. If it rains tomorrow, I (stay) at home.
2. He will take a trip to Beijing if he (be not) busy next week.
3. Please tell Li Jun about it if he (come) back.
4. If you don't wear your school uniform to school, the teachers (not let) you in.
5. If you put a lot of sugar in water, it (taste) sweet.

1. will stay 2. isn't 3. comes 4. won't let 5. tastes

二、根据汉语意思完成句子,每空一词。
6. 如果你步行去学校,你会迟到的。
If you to school on foot, you late.
7. 如果我们今天举行聚会,将会发生什么事情?
What if we the party today?
8. 如果你没有身份证,你就不能去参加聚会。
If you your ID card, you to the party.
9. 如果你努力学习,你会成功的。
If you , you successful.
10. 如果你乘坐出租车,你会早点儿到机场。
If you , you at the airport earlier.

6. go;will be 7. will happen;have 8. don't have;can't go 9. work/study hard;will be 10. take a taxi;will arrive

三、同义句转换,每空一词。
11. If you don't help me, I can't catch up with the others.
I can't catch up with the others .
12. Take a taxi,and you'll catch the train.
you a taxi,you'll catch the train.
13. There will be a basketball game unless it rains.
There will be a basketball game .
14. We will be late for the meeting if we aren't quick.
We will be late for the meeting .
15. If you are late,the teacher will be angry.
late, the teacher will be angry.

11. without your help 12. If;take 13. if it doesn't rain 14. unless we are quick 15. Don't be;or