英语学科常识
从句在复合句中充当主语成分的句子叫做主语从句。引导主语从句连词有that,whether,who,what,whatever等。连词位于句首不能省略。
句 1:she likes me.
句 2:It makes me happy.(It 是句子的主语)
我们将句 1 合到句 2 上,变成一个主语从句,就是这样:
句 3:That she likes me makes me happy.
我们把句 2 的主语It,换成了句 1,然后加上了that,就变成了句 3 这个主语从句。(句 3 的其他成分,还是句 2 原来的部分,只换了主语)。
当主语比较长的时候,常用It这样一个简单的词来充当主语,而把it指代的一个句子放在后面,让句子看起来更清爽。
for example:
正常的主语从句:That she likes me makes me happy.
修改之后的主语从句:It makes me happy that she likes me.
主语从句不可位于句首的五种情况:
(1) if引导的主语从句不可居于复合句句首。
(2) It is said , (reported) …结构中的主语从句不可提前。例如:
It is said that President Jingo will visit our school next week.
(3) It happens…, It occurs… 结构中的主语从句不可提前。例如:
It occurred to him that he failed in the examination.
(4) It doesn’t matter how/whether …结构中的主语从句不可提前。例如:
It doesn’t matter whether he is wrong or not..
(5) 含主语从句的复合句是疑问句时,主语从句不可提前。例如:
Is it likely that it will rain in the evening?