it was because she was seriouslyill that she didn'tcome to the lecture yesterday
because可不可以换做as,for,since?
she was seriously ill.....(打错了）
不能 ,虽然在主从复合句 原因状语从句中 我们说表示原因 有as,for,since,because这几个词,但是他们都在语气盒用法上有很大区别的
语气上 because最强,然后是as ,再是for,最后是since.
用法上,for 一般只能放在句中,表原因.并含有 通过现象推测的含义.
since语气最弱,有‘既然'的意思.
as,表原因 既可以放在 句首也可以放在句中,但语气弱于 because.
既然是强调原因的 强调句 当然用because最强最合适.
强调原因一般那只能用because 和why 两个词 取决于后面接的是原因还是原因导致的结果.若是原因则用because,若是结果用问why 可替换
she was seriously ill;that is why she didn't come to the lecture yesterday.后面是个表语从句
在强调句it is +强调部分 句型中 我们常用 it was because.句型 所以用 it was because she was seriouslyill that she didn'tcome to the lecture yesterday
