三加三不加原则 也可以总结为 “六用三不用”,详解如下。
that引导定语从句时,既可以指人又可以指物,在定语从句中作主语、谓语动词的宾语或系动词的表语,但不能放在介词后面作介词宾语。注意:that在定语从句中作宾语时可以省略。如:
The lette that I received yesterday was from my father. 我昨天收到的那封信是我父亲来的。(that 指The letter,在从句中作宾语,可以省略)
All the apples that fall down are eaten by the pigs. 掉下来的所有的苹果都被猪吃了。(that 指All...