補充:
1. 關系代詞which, who, whom, that如果在從句中作賓語,可以省略。
1. 關系代詞在定語從句中做主語時,從句中謂語動詞的人稱和數必須與先行詞一致。
2. 在下列情況下一般用that做為定語從句的引導詞:
a.先行詞為all(全部), everything(每件事情/動詞), nothing(沒有), anything(任何事/東西), little(少許)等不定代詞時,如:
everything(that)we saw at the exhibition(展覽會) was very interesting(有趣的).
b、先行詞為序數詞或形容詞最高級所修飾時。如:
the first(第一) thing(that)you have to do is to register(登記注冊).
this is the most exciting(令人興奮的) football(足球) game(比賽) (that) i have ever seen(看).