2. as if, because 也可引导表语从句。 It looks as if it’s going to rain. It was because I got up late. 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beca...