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新人教版八年级上册英语Unit 8 Section A 第3课时 (Grammar Focus)同步训练
【语法专题精讲】
if意为“如果”，表示假如有从句动作的发生，就会有主句动作的发生。从句放在主句前时后均可用逗号与主句隔开。
概念 & 句型转换 时态呼应（从句用一般现在时的情况）
- If it rains tomorrow, we won't go for a picnic.
如果明天下雨，我们将不去野餐。
- If + 肯定意义的从句 + 主句 = 祈使句 + and + 句子.
If you study hard, you can pass the exam.
→ Study hard, and you can pass the exam.
- If + 否定意义的从句 + 主句 = 祈使句 + or + 句子.
If you don't hurry up, you will be late.
→ Hurry up, or you will be late. - 主句为一般将来时：
If she comes, I'll call you up. 如果她来了，我将给你打电话。
- 主句是祈使句：
Please go to see the doctor if you don't feel well.
如果你感觉不舒服，请去看医生。
- 主句含有情态动词：
If he goes on smoking, it may be harmful to his health.
如果他继续吸烟，这可能对他的健康有害。
语法专题精练
A 强化语法
Ⅰ. 单项选择
( )1.(2023长春) It is really dangerous ______ people run the red traffic light.
A. unless B. if C. though D. until
( )2.（家国情怀）(2023安徽) Our country will be much better for everyone in future ______ we all do something to help now.
A. if B. before C. so that D. even though
( )3.(2024福建) You can feel better ______ you take a walk in the park just for 20 minutes.
A. if B. before C. until
( )4.(2024广元)—When is the school sports meeting
—It is going to be held next Thursday if it ______ that day.
A. rains B. will rain C. won't rain D. doesn't rain
( )5.(2024绥化) He ______ much healthier if he ______ enough exercise in his free time.
A. is; take B. will be; takes C. will be; take
Ⅱ. 按要求完成下列各题,每空一词
6. Get up early, or you will be late for the meeting.（改为同义句）
______ you ______ get up early, you will be late for the meeting.
7. Finish your homework and you can watch TV.（改为同义句）
______ you finish your homework, you ______ watch TV.
8. I will be available this weekend. I will visit my aunt.（用if合并为一句）
______ ______ ______ available this weekend, I ______ ______ my aunt.
9. I can finish the work on time. He'll help me.（用if合并为一句）
______ he ______ ______, I ______ finish the work on time.
10. You won't have a better life unless you work harder.（改为同义句）
You won't have a better life ______ you ______ work harder.
B 教材要点回归 夯实基础
Ⅲ. 用所给单词的适当形式填空
11. There will be a parents' ______ (meet) this Saturday afternoon.
12. My tennis ______ (train) begins at 3:00 p.m. every day.
13. You must be ______ (care) with your words, or your friends might be angry.
14. The old man had ______ (difficult) finding the way to the museum.
15. Don't take it so ______ (serious). Your brother is just kidding.
Ⅳ. 根据汉语意思完成句子
16. 如果你看到火灾，你应该马上报警。
If you see a fire, you should call the police ______ ______.
17. 我打算给他写一封信。
I'm going to ______ him ______ ______.
18. 你最好提前制订一个计划。
You'd better ______ ______ ______ ahead.
19. 深呼吸能帮助你保持镇静。
Taking a deep breath can help you ______ ______.
20. 如果你犯错了，你应该向他道歉。
If you make a mistake, you should ______ ______ to him.
C 知识综合运用 提升能力
Ⅴ. 语法填空
阅读下面的短文，在空白处填入一个适当的单词，或填入括号中所给单词的正确形式。
We have different kinds of problems in our daily life. If we can't find ways 21. ______ (solve) them, life can be hard.
22. ______ a junior high school student, I often meet with problems. When that happens, I will talk to my 23. ______ (friend). They are of the same age as me, 24. ______ they can understand me well. We tell each other problems and find solutions(解决方法). Their 25. ______ (advise) is really helpful. If I am at home, I 26. ______ (talk) about the problem with my parents, because they have more experience than me and can give me 27. ______ (use) suggestions. I never make myself lonely(孤独的) when I am in trouble. That's because it often makes me feel even 28. ______ (bad). I love being with others, so I always tell the people around me 29. ______ the problem is.
Remember to believe in 30. ______ (you). There is sunshine every day!

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