because since as for四者语气的比较？

当它们作为"因为"讲,

because>since>as>for

主要区别是在用法上
because
KK: []
DJ: []
conj.
1. 因为
He is absent because he is ill.
他因病缺席。

since
KK: []
DJ: []
ad.(常用于现在完成时或过去完成时)
1. 此后;从那时到现在
She left school three years ago and has worked as a nurse ever since.
她三年前毕业,从那时起便一直当护士。
2. 之前,以前
prep.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
I haven't heard from him since last year.
我自去年以来未曾收到过他的信。
conj.
1. (常用于现在完成时或过去完成时)自...以来,从...至今
It's been ten years since they married.
他们结婚到现在已经十年了。
She has been living a hard life since her husband died.
她自从丈夫死后,一直过着艰苦的生活。
2. 既然;因为,由于
He must have taken the book since it isn't here.
他一定是把书拿走了,因为书已不在这里了。
Since it is so hot, let's go swimming.
既然天气这么热,我们去游泳吧。
as
KK: []
DJ: []
ad.
1. 跟...一样地,同样地
Sam is as rich as Alexander.
山姆像亚历山大一样富有。
2.