知识点总结
是用来说明引起主句这个结果的原因的从句,在初中阶段引导原因状语从句的从属连词主要的有because, as, since,for等。例如:
1.I didnt go to school yesterday because I was ill. 我昨天没去上学,因为我生病了。
2. Since everybody is h ere, lets begin our meeting. 既然大家都来了, 让我们开始开会吧.
3. As you are in poor health, you should not stay up late. 既然你身体不好, 你就不该熬夜.
4.I asked her to stay to tea, for I had something to tell her. 我请她留下来喝茶,因为我有事要告诉她.
原因状语从句应注意的问题
1、because , since , as , for,辨析
1)because语势最强,用来说明人所不知的原因,回答why提出的问题。当原因是显而易见的或已为人们所知,就用as或 since。
I did nt go, because I was afraid.
Since /As the weather is so bad, we have to delay our journey.
2)由because引导的从句如果放在句末,且前面有逗 号,则可以用for来代替。但如果不是说明直接原因,而是多种情况加以推断,就只能用for。例:
He is absent today, becaus e / for he is ill. He must be ill, for he is absent today.
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