as、for和since的用法區別

下面是小編整理的一些關於as、for和since的用法和區別， 希望對大家有幫助。

as和for都有“因爲”的意思.但是as比for的語氣弱用來表示顯而易見的原因,而for卻有一種解釋說明的語氣.

例：as it is raining,we have to call of the meeting.

please forgive him,for he is only 13 years old.

for ,because,as,since這四個詞作爲連詞,都有"因爲"的意思,但它們在用法上有區別：

because 是從屬連詞,接表示直接原因的從句,一般放在主句的後面,也可放在主句前面,它表示的語氣最強,在回答why的問句時,必須用because.

例如：The swimming pool won't be open today because they're making repairs.

游泳池今天不開放,因爲他們在修理.

Why did you move to France?

你們爲什麼搬到法國?

Because my father found work in Paris.

因爲我父親在巴黎找到了工作.

注意：在英語中用了because後,不可再用so.

as 是從屬連詞,說明一般的因果關係,語氣比because弱,說明比較明顯的原因,它引導的從句通常放在句首,有時也可放在句末.

例如：As it is raining, you'd better take a taxi.

天下雨了,你最好乘出租車.

since 意爲"既然",表示對方已知的無需加以說明的原因或事實,語氣比because弱,但是比as 強.

例如：Since we have no money, we can't buy that vase.

既然我們沒錢,我們就不能買那花瓶.

Since everybody is here, let's begin our party.

既然大家都到了,那就開始我們的聚會吧!

for 是並列連詞,用來附帶解釋說明前一分句的原因或理由,for引導的並列句,一般放在所要說明的句子的後面.

例如：I went to see him, for I had something to tell him.

我去見他,因爲我有事要告訴他.