上次，我們學(xué)習(xí)了如何“退一步”，也即讓步狀語(yǔ)從句的知識(shí)考點(diǎn)。今天，小編打算分享一個(gè)新東西，幫大家理清楚世事的來龍去脈。它就是我們的——原因狀語(yǔ)從句。

其實(shí)呢，這世上的事情并不復(fù)雜，只需搞懂它的因?yàn)?所以，種種疑難雜癥便會(huì)不攻自破！

好啦，廢話不多說，我們快來開啟原因狀語(yǔ)從句之門吧！(?⊙ω⊙)??


一、because, since/now that, as的用法區(qū)別：

考點(diǎn)1：because引導(dǎo)的原因狀語(yǔ)從句可位于句首、句中。because表直接原因，語(yǔ)氣最強(qiáng)，回答why引導(dǎo)的疑問句。

I didn't go because I was afraid.

I can't get to sleep because there is too much noise outside.

We went by bus because it was cheaper.


注意：because不能與so連用。

I do it because I like it. = I like it so I do it. （??）

Because I like it so I do it. （??）

He can't go to school because he is ill.= He is ill so he can't go to school.（??）

Because he is ill so he can't go to school. （??）


考點(diǎn)2：since引導(dǎo)的原因狀語(yǔ)從句一般放于主句之前，表示雙方已知的、 顯然的理由，(翻譯成“既然”= now that )，語(yǔ)氣比because弱。

Since he has a car now, it is much easier for him to go out.

Since you are free today, can you help me with my work?

Now that you are an adult, you should rely on yourself.

Now that she was indoors, she had not been wearing a coat.


考點(diǎn)3：as引導(dǎo)原因狀從一般放在句首，表示附帶說明的“雙方已知的原因”，含有對(duì)比說明的意味，語(yǔ)氣比since弱。

As he is still a young boy, you may forgive him.

As you are tired, you had better have a rest.

I went to bed early, as I was tired yesterday.


考點(diǎn)4：for引導(dǎo)的并列句只能放于句中，必須用逗號(hào)隔開，語(yǔ)氣最弱，用來表推測(cè)。

It must have rained last night, for the road is wet.

He could not have seen me, for I was not there.

He seldom goes out now, for he is very old.


二．when也可以引導(dǎo)原因狀語(yǔ)從句，表示“既然”。

I won't tell you when you won't listen.

It was foolish of you to take a taxi when you could easily walk there in five minutes.


小編寄語(yǔ)：

1). 回答why引導(dǎo)的疑問句用because，但不能與so連用；

2). for引導(dǎo)的并列句只能放于句中，并用逗號(hào)隔開；

3). when也可以引導(dǎo)原因狀語(yǔ)從句，表示“既然”。

--摘自：百詞斬