3. 在非正式文体中,引导表语从句的that可以省略。如: The trouble is (that) he is ill 注意:在表语从句中,当reason做主语时, 引导词只能用that,不能用because,如:他迟到的原因是因为他没有赶上早班车。 The reason why he was late was that he didn’t catch the ea...