内容正文:
中考英语语法复习:主将从现
(重难点、易错点+中考模拟+强化训练)
一、本质定义
「主将从现」:当主句表示将来动作,由 if(如果)/ unless(除非)/ when(当…时)等引导的条件或时间状语从句需用一般现在时代替将来时。
核心公式: 中考必考!
If/When + 主语 + V原/V三单 , 主语 + will/be going to + V原
2、 为什么要用“主将从现”?
核心原因有以下几点:
1. 避免冗余和逻辑冲突:
这是最主要的原因。时间状语从句和条件状语从句的连词本身已经暗示了时间或条件关系。 I will call you when I arrive at the airport. (不能用 when I will arrive) - when 已经明确指向“到达机场”这个将来时刻。
2. 遵循“时间从属”原则:
在复合句中,从句的动作或状态通常是依附于主句动作发生的时间点或条件的。
As soon as she has finished her work, she will join us. (用现在完成时强调“完成工作”这个前提条件发生在“加入我们”之前)
3. 英语时态体系的简洁性与一致性要求:
英语尽量避免在同一个句子框架内重复使用相同或非常相似的时态结构,尤其是在连词已经提供了足够的时间信息的情况下。在主句明确使用将来时态的情况下,从句用现在时态是一种清晰、经济和符合逻辑的选择。
常见错误示例:
❌If I will see him, I will tell him the news.(错在主句用将来时了)
✅If I see him, I will tell him the news.(正确:主句will tell,从句see)
❌When he will arrive, I will go pick him up.(错在主句用将来时了)
✅When he arrives, I will go pick him up.(正确:主句will go,从句
三、主将从现三步判断法
从句用一般现在时,主句用一般将来时
口诀
“主将要未来,从现表将来,
if/when 引条件,will/going to 莫进来!”
四、三大从句类型 必背!
1. 条件从句 (if, unless)
- 规则:if条件句用现在时,主句用将来时
✅ If it rains tomorrow, we will cancel the picnic.
❌ If it will rain tomorrow... (经典错误!)
2. 时间从句 (when, before, after, until, as soon as)
- 规则:时间状语从句用现在时,主句用将来时
✅ When he arrives, I will call you.
❌ When he will arrive...
3. 让步从句 (even if, as long as)
- 规则:让步状语从句用现在时,主句用将来时
✅ Even if she refuses, I will try again.
五、特殊形式:「主祈从现」与「主情从现」
当主句不是将来时,而是祈使句或情态动词时,从句仍用一般现在时:
1. 主祈从现
✅ If you see him, tell him to call me. (祈使句作主句)
2. 主情从现
✅ If you finish homework, you can play games. (情态动词can作主句)
六、易错点深度剖析
错误类型
典型错句
正确形式
错误原因
从句误用will
❌ If he will come, I will stay.
✅ If he comes, I will stay.
从句中禁止出现will/shall
主句误用现在时
❌ If it rains, we cancel the trip.
✅ If it rains, we will cancel the trip.
主句必须体现将来时
主从句时态倒置
❌ I will tell him when he will return.
✅ I will tell him when he returns.
时间从句需用现在时
忽略三单变化
❌ If she study hard, she will pass.
✅ If she studies hard, she will pass.
三单主语后动词必须加s/es
七、中考模拟(8题)
1. I ______ you as soon as I ______ the news.
A. will tell; get B. tell; will get C. will tell; will get
2. Don't leave the room until your mother ______ back.
A. comes B. will come C. came
3. If he ______ free tomorrow, he will join us.
A. is B. will be C. was
4. —When ______ you ______ me the book?
—After I finish reading it.
A. will; return B. do; return C. are; returning
5. We won't start the meeting until everyone ______.
A. arrives B. will arrive C. arrived
6. If it ______ sunny, we ______ to the park.
A. is; will go B. will be; go C. is; go
7. Call me when you ______ at the airport.
A. arrive B. will arrive C. arrived
8. Unless he ______ hard, he won't pass the exam.
A. studies B. will study C. studied
8、 强化训练
Part 1: 基础巩固(时间/条件状语从句)
1. If it ______ (rain) tomorrow, we ______ (cancel) the picnic.
2. I ______ (call) you as soon as I ______ (arrive) in London.
3. She ______ (not go) to the party unless she ______ (finish) her work.
4. When you ______ (see) Tom, ______ (tell) him to email me.
5. We ______ (start) dinner after Dad ______ (come) home.
Part 2: 进阶挑战(混合时态+复合句)
6. He ______ (be) angry if you ______ (not apologize) to him.
7. By the time you ______ (read) this email, I ______ (leave) for Paris.
8. Please ______ (turn) off the lights when you ______ (leave) the room.
9. If they ______ (invite) us, we ______ (join) their wedding.
10. She ______ (not pass) the exam unless she ______ (study) harder.
Part 3: 易错陷阱(区分从句类型)
11. I don’t know if she ______ (come) to the meeting tomorrow. (宾语从句)
12. The day when we ______ (meet) again will be wonderful. (定语从句)
13. We’ll go hiking unless it ______ (snow). (条件状语从句)
14. Tell me what you ______ (do) this weekend. (宾语从句)
15. She’ll buy the dress if it ______ (be) on sale. (条件状语从句)
Part 4: 综合应用(翻译句子)
16. 如果明天天气好,我们就去爬山。
→ If the weather ______ (be) fine, we ______ (go) hiking.
17. 你一完成作业就可以看电视。
→ You ______ (watch) TV as soon as you ______ (finish) your homework.
18. 除非他道歉,否则我不会原谅他。
→ I ______ (not forgive) him unless he ______ (apologize).
19. 会议开始前请把手机关静音。
→ Please ______ (silence) your phones before the meeting ______ (start).
20. 如果她打电话来,告诉她我在图书馆。
→ If she ______ (call), ______ (tell) her I ______ (be) in the library.
答案与解析
七、中考模拟(8题)
1. A (as soon as引导时间从句用一般现在时)
2. A (until引导时间从句用一般现在时)
3. A (if条件句用一般现在时)
4. A (主句询问将来动作,after从句用现在时)
5. A (until从句用一般现在时)
6. A (if从句用is,主句用will go)
7. A (when引导时间从句用一般现在时)
8. A (unless=if not,条件从句用现在时)
八、强化训练
Part 1
1. rains; will cancel(条件状语从句:if + 一般现在时,主句将来时)
2. will call; arrive(时间状语从句:as soon as + 一般现在时)
3. won’t go; finishes(条件状语从句:unless = if not)
4. see; tell(主句是祈使句,从句用一般现在时)
5. will start; comes(时间状语从句:after + 一般现在时)
Part 2
6. will be; don’t apologize(条件句,主句将来时)
7. read; will have left(时间状语从句:By the time + 一般现在时,主句将来完成时)
8. turn; leave(主句祈使句,从句一般现在时)
9. invite; will join(标准条件句)
10. won’t pass; studies(unless 引导条件句)
Part 3(易错点!)
11. will come(宾语从句,if = “是否”,需用将来时)
12. meet / will meet(定语从句,when 修饰“the day”,可用将来时)
13. snows(unless 引导条件状语从句,用一般现在时)
14. will do(宾语从句,询问未来计划)
15. is(条件状语从句,用一般现在时)
Part 4
16. is; will go
17. can watch; finish(主句含情态动词 can,从句用一般现在时)
18. won’t forgive; apologizes
19. silence; starts(主句祈使句,从句一般现在时)
20. calls; tell; am(主句是祈使句,从句用一般现在时;宾语从句“I am”用现在时)
学科网(北京)股份有限公司
$$