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新外研版2026年英语九年级上册
Unit 1 Teenagers today（青少年与责任）语法专讲专练
一，核心语法知识点（if / because 引导的状语从句）
1. if 引导条件状语从句
含义：表“如果/假如”，说明主句动作发生的条件。
结构：if+从句（一般现在时），主句（一般将来时/情态动词）
例句：If I move my fingers, it will come to life. - 关键：遵循“主将从现”原则，即从句用一般现在时，主句用将来时。
2. because 引导原因状语从句
含义：表“因为”，说明主句动作发生的原因。
结构：主句 +because +从句（或 Because + 从句，主句）
例句：I felt less close to the art because people thought puppets were too old-fashioned.
关键：回答“why”的问题，不能与 so 连用（不能说 Because..., so...）。
3. 易混点区分
if：表条件，侧重“在某种情况下会发生某事”；
because：表原因，侧重“解释为什么发生某事”。
考点：if从句用一般现在时，主句用一般将来时(will+动词原形)
考点：because不和so连用、主将从现
一、用所给词适当形式填空
1. If it ________ (not rain) tomorrow, we ________ (go) hiking.
2. He ________ (help) you with English if he ________ (have) free time.
3. If you ________ (finish) your homework early, you ________ (watch) cartoons.
4. I ________ (tell) him the news if I ________ (meet) him this afternoon.
5. They can go to the zoo if they ________ (get) up early.
二、选词填空：if / because
1. I stay at home ________ I have a bad cold.
2. ________ you practice every day, your English will improve quickly.
3. She cried ________ she lost her favorite toy.
4. We will have a picnic ________ the weather is fine this Sunday.
5. He didn’t buy the book ________ it was too expensive.
三、按要求改写句子
1. I won’t go to the party. It rains.（用if合并句子）
________________________________________
2. Why didn’t you arrive on time （用because回答，miss the bus）
________________________________________
3. Because the film is boring, I don’t want to see it.（同义句，改用so）
________________________________________
四、改错（每题一处错误，划出并改正）
1. Because it was cold, so I put on my coat. ____________
2. If he will come, I am very happy. ____________
3. I buy a new pen if I have enough money tomorrow. ____________
4. Because she is tired, so she goes to bed early. ____________
五、汉译英
1. 如果明天天晴，我们就去放风筝。 ________________________________________
2. 我没有出去玩，因为外面在下雨。 ________________________________________
参考答案
一、动词填空
1. doesn’t rain; will go 2. will help; has 3. finish; will watch 4. will tell; meet 5. get
二、选词填空
1. because 2. If 3. because 4. if 5. because
三、句型改写
1. I won’t go to the party if it rains. 2. I didn’t arrive on time because I missed the bus. 3. The film is boring, so I don’t want to see it
四、改错
1. 去掉Because 或去掉so 2. will come → comes 3. buy → will buy 4. 去掉Because 或去掉so
五、汉译英
1. If it is sunny tomorrow, we will fly kites. 2. I didn’t go out to play because it rained outside.

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