初中英语语法之连词专项练习

初中英语语法连词词专项习题

[ Because, since, as, for ]

because, as, for, since这几个词都是表示“原因”的连词，语气由强至弱依次为：because→since→as→for;其中because, since, as均为从属连词，引导原因状语从句；而for 是并列连词，引导并列句。

1. because表示直接原因，它所指的原因通常是听话人所不知道的，其语气最强。常用来回答why的提问，一般放于主句之后，也可以单独存在。例如：(1)I stayed at home because it rained. 因为下雨我呆在家里。

(2)Because Lingling was ill, she didn't come to school. 玲玲因病，没有上学。(3)—Why is she absent? 她为什么缺席？—Because she is sick. 因为她病了。

此外，在强调句型中，只能用because。例如：

(4)It was because I missed the early bus that I was late f or school. 我上学迟到是因为我没有赶上早班汽车。

2. since侧重主句，从句表示显然的或已为人所知的理由，常译为“因为”、“既然”，语气比because稍弱，通常置于句首，表示一种含有勉强语气的原因。例如：

(1)Since he asks you, you'll tell him why. 他既然问你，那就告诉他为什么吧。(2)Since everyone is here, let's start. 既然大家都到齐了，我们就出发吧！

(3)Since I understood very little Japanese, I couldn't follow the conversation. 我日语懂得不多，因而听不懂对话。

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，含义与since相同，但语气更弱，没有since正式，常译为“由于，鉴于”。从句说明原因，主句说明结果，主从并重。例如：

(1)We all like her as she is kind. 我们都喜欢她，因为她善良。

(2)As I had a cold, I was absent from school. 因为我感冒了，所以没去上课。

(3)As Xiaowang was not ready, we went without him. 由于小王没有准备好，我们只好不带他去了。

4. for用作连词时，与because相似，但它所表示的原因往往提供上文未交待过的情况。for不表示直接原因，表明附加或推断的理由，因此for被看作等立连词，它所引导的分句只能放在句子后部(或单独成为一个句子)，并且前后两个分句间的逻辑关系不一定是因果关系，其间用逗号隔开，且for不可置于句首，for的这一用法常用在书面语中，较正式。例如：

(1)The days are short, for it is now December. 白天短了，因为现在已是十二月份。(2)It must have rained, for the ground is wet. (从“地面潮湿”作出“下过雨”的推测，但地湿并不一定是下雨所致, for不可以换为because。)

(3)The ground is wet because it has rained. (“下雨”是“地上潮湿”的直接原因。) 前后两个分句间有一定的因果关系时(有时很难区分是直接原因，还是推测性原因)，for与because可以互换使用。例如：

(4)I could not go, for / because I was ill. 我没能去，是因为我病了。

(5)He felt no fear, for / because he was a brave boy. 他没有害怕，因为他是个勇敢的男孩。

Because/as

because 引导的是必然原因，as引导一般原因。必然原因是指某事发生必会导致另一件事实。

一般原因语气还有其因果关系不是很明显。以下两个句子请体会The floor is wet,because it rained this morning.

As the floor is wet, it might rain this morning.(地板湿也可能是其他原因，以此看，as引导原因从句还有猜测的意味。)

Because/for

这两个词的意思很相近，通常是可以互换使用的。为了安全起见，最好用because引导从句，因为同because引导的从句相比，for引导的从句（英文中称为for－clause）的用法要受到某些限制：

1 for引导的从句不能位于它所解释的动词之前：Because it was wet he took a taxi．因为下雨，他叫了一辆出租车。（这里不能用for。）

2 for引导的从句不能位于not，but或任何连词之后：

He stole，not because he wanted the money but because he liked stealing．他偷东西，并不是因为他想要钱，而是他有这种毛病。（这里不能用for。） 3 for 引导的从句不能用于回答问题：—Why did you do it？

—I did it because I was angry．—你为什么这么做？

—因为我生气才这么做的。（这里不能用for。）

4 for引导的从句不能单单用来复述已讲过的话，而必须包括新的容：He spoke in French．She was angry because he had spoken in French．他讲法语。因为他讲法语，她生气了。（这里不能用for。）但是可以说：She was angry，for she didn’t know French．她生气了，因为她不懂法语。（这里用for是正确的，也可用because。）之所以有这些用法上的限定，其理由是for引导的从句不能直接说明某一特定动作发生的原因，而只能提供一些起帮助解释作用的附加说明。例句如：

The days were short，for it was now December．天短了，现在已是12月了。

He took the food eagerly，for he has eaten nothing since dawn．他狼吞虎咽地吃了起来，因为他从天亮就没吃过东西。

1. He can speak English_______ Chinese.

A. but

B. also

C. so

D. and

2. Physics is not so easy, _______I like it very much.

A. but

B. or

C. since

D. because

3. Will Tom wait for her at home ______ at the library?

A. or

B. as

C. so that

D. both

4. She has a son _______ a daughter.

A. but

B. and

C. so

D. or

5. I'll give her the gift ______ she arrives.

A. so

B. before

C. as soon as

D. since

6. Tom was ____ill that we had to send for a doctor.

A. so

B. very

C. and

D. too

7. The woman was____ angry_____ she couldn't speak anything.

A. neither…nor

B. either…or

C. both…and

D. so…that

8. ______we got home it was very late.

A. When

B. While

C. Because

D. As

9. We heard clearly_____ she said.

A. what

B. which

C. before

D. because

10. I can't sleep well at night, ______I often feel very tired in the day.

A. so

B. because

C. and

D. or

11. When you're learning a foreign language, use it, ______ you will lose it.

A. but

B. or

C. then

D. and

12. --- Can you play football?

--- Yes, I can, ______ I can't play it very well.

A. or

B. and

C. but

D. so

13. Study hard, ______ you will fall behind.

A. and

B. but

C. so

D. or