北师大版初中英语九年级全一册知识梳理

北师大版初中英语九年级全一册
Unit 1 Learning to Learn
一、内容：学会用英语简单描述个人学习英语的困难、方法和征询好的语言学习方法。
二、重点和难点：
1. 情态动词may，might的用法
2. 连词if，unless，once的用法
3. 连词的用法
4. 情态动词表达建议
5. 重点词汇和词组
三、具体内容：
（一）情态动词may，might的用法
May可以表示没有把握的推测，意思是“可能”，但只能用于肯定句，might表示推测时，不表示时态，只是可能性比may小。May还可以表示允许或请求的意思，用might则语气更加委婉，客气。
May主要用于第一人称，而且比can正式得多。
例句：
May I ask you a question?
Might I use your eraser for a while?
Yes, please. Yes, you may.
No, you mustn't.
No, you had better not.
No, you can't.
（二）连词if，unless，once的用法
例句：
If that is true, what should we do?
Give me a call once you arrive at the airport.
Once I finish my homework, I will call you.
I won't remember new vocabulary unless I hear them.
从属连词：只能用来引导从句，不能引导词或词组。这些从属连词包括：that, when, till, after, before, since, if, because, though, although, so...that, so that..., as soon as, once...等。
1. 引导名词性从句的从属连词：
（1）that
He said (that) he would come.
That she is still alive is true.
（2）if
I wonder if he is at home.
（3）whether
I asked him whether he would come.
2. 引导状语从句的从属连词：
（1）连接时间状语从句的从属连词：
I have lived in this city since I was born.
He came to China after the war was over.
The war had been over before he came to China.
（2）连接地点状语从句的从属连词：
Where there is smoke, there is fire.
（3）连接让步状语从句的从属连词：
Although/Though Japan is small, the population is big.
Even if it was snowing heavily, we went on running.
（4）连接原因状语从句的从属连词：
I do it because I like it.
Since you know all about it, tell me please.
As you are in poor health, you should not sit up late.
（5）连接目的状语从句的从属连词：
He works hard so that he may pass the exam.
（6）连接条件状语从句的从属连词：
If it rains tomorrow, we won't go on a picnic.
He will come unless it rains.
Once he comes back, I will let him call you.
（7）连接结果状语从句的从属连词：
He is so kind that everyone likes him.
（三）四个连词词组的使用：
（1）either...or...：或者...或者...，不是...就是...。
Here are two bags. You can take either the red one or the black one.
You can either call me or speak to me tomorrow.
Either he or his brother knows the way there.
（2）both...and...：既...也，两个都。
Both Tom and Jim like playing chess.
The little boy studies both music and dance at the art school.

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