表語從句在復合句中作表語的名詞性從句，放在系動詞之后，一般結構是“主語+連系動詞+表語從句”?？梢越颖碚Z從句的連系動詞有be, look, remain, seem等。引導表語從句的that?？墒÷浴Ａ硗?，常用的還有the reason is that… 和It is because 等結構。例如：

　　1) The question is whether we can make good preparation in such ashort time.

　　2) This is why we can’t get the support of the people.

　　3) But the fact remains that we are behind the other classes.

　　4) The reason he is late for school is that he missed the early bus.