北师大版初三英语第6讲：unit3语法篇(学生版)-

理解并掌握常见连词及表示原因连词的用法
1. 常见连词 (and, but, or, so)的用法
(1) and“和，而且，又” ，表示并列关系。例如：
I woke up and got out of bed.
我醒了就起床了。
(2) but “但是”表示转折关系。例如：
I got up early but I still missed the first bus.
我听见外面有些声音，所以走出房间去看看是怎么回事。
2. because, since, as, for表示原因的区别
because, since, as 都是表示“原因”的从属连词，引导原因状语从句；而“ 引导的是并列句。语气由强至弱一次为： because, since, as, for。
for ”也表示原因，
Unit 3 语法篇
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3. You ’d better wake up Tom at 6: 30, ______ he will be late for the match.
A. but
B. and
C. or
D. so
4. To make our dreams come true, we should have aims________ then try out best to achieve it.
昨晚一定下了雨，因为地面是湿的。 3. 其他常见连词
(1)if 如果，表示条件，引导条件状语从句。
unless, 除非，如果不 =if … not。例如：
If it doesn ’t rain tomorrow, we will go to the park.( 前半句可改为 Unless it rains tomorrow)
A. before
B. when
C. since
D. until
7. It is dark, _______ let ’s go home.
A. so
B. an________ I ’m a little disappointed, I can still accept the result.
(1) because 表示直接原因， 它所指的原因一般是听话人所不知道的， 的提问，一般放在主句之后，也可以单独存在。例如：
语气最强。 常用来回答 why
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--- Because I missed the early bus. 因为我错过了早班车。
A. Since
B. Because
C. Although
D. For
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9. We will stay at home, ________ there is a traffic jam tomorrow.
A. if
B. unless
我起得很早，但仍然错过了早班车。
(3) or“或者；否则” 。例如：
Hurry up, or you will be late. 快点儿，否则你就要迟到了。
(4) so“所以”，表示因果关系。例如：
I heard some noise outside, so I went out of the room to see why.
A. and
B. but
C. so
D. or
5. I didn ’t go surfing, _________ it was too cold.
A. though
B. so that
C. because
D. since
6. Rick has learned a lot about Chinese culture ________ he came to China.
C. but
D. because
10. ---Hello, Joyce, you are busy. Can I give you a hand?
since 语气弱，没有 since 正式，常译为“由于，鉴于” 。从句说明原因，主句说明结果，主从句 并重。例如：
As I was not ready, they went without me.
由于我没有准备好，他们没有带我去。
(4) for 表明附加或推断的理由，其后的分句不能放句首，语气最弱。例如： It mush have rained last night, for the ground is wet.
如果明天不下雨，我们就会去公园。
(2)although 虽然，尽管，引导让步状语从句。不与 but 连用。例如：
Although no man agreed with him, he held on his views.
尽管没人赞同他的观点，他还是坚持自己的看法。
1. Tom was late for school __________ it ’s raining hard.
(2) since 侧重主句，从句表示显然的或者已为人所知的理由， 稍弱，通常置于句首，表示含有一种勉强语气的原因。例如：
常译为“因为，既然”，语气比 because
Since everybody is here, let ’s begin. 既然大家都在这里，我们开始吧。 (3) as 是常用词，它表示的原因是双方已知的事实或显而易见的原因，或者理由不是很重要；比
A. because of
B. because
C. due to
D. so
2. Read this article, ________ you will understand that not everything can be bought with money.
A. or
B. so
C. but
D. and