3. 狀語從句中的省略：當(dāng)狀語從句中的主語和主句的主語一致或從句主語是it, 并且從句謂語中有be動詞時, 常可以省略從句中的主語和be動詞。此類狀語從句中的省略有如下情況: （1）在as, before, till, until, when, while等引導(dǎo)的時間狀語從句中。While(I was)walking along the street, I heard my name called.（2）在though, although等引導(dǎo)的讓步狀語從句中。Though(they were)tired, they went on working. （3）在if, unless等引導(dǎo)的條件狀語從句中。You shouldn’t come to his party unless(you are)invited. （4）在as, as if, as though等引導(dǎo)的方式狀語從句中。He did as(he was)told. （5）在虛擬語氣中, 常省掉if, 從句使用倒裝句式。Were I you(=If I were you), I should give that guy a good lesson. 4. 定語從句中的省略（1） 一般說來, 在限制性定語從句中, 作賓語的關(guān)系代詞that, which, who, whom可以省略; 而在非限制性定語從句中作賓語的關(guān)系代詞不可以省略。 The man (whom)you saw yesterday fell ill.The man, whom you saw yesterday, fell ill. （2） 當(dāng)先行詞是way, 且引導(dǎo)詞在定語從句中作方式狀語時, 引導(dǎo)詞可用in which或that, 也可以省略。 The way( in which/that )these comrades treat problems is wrong.固定短語中的省略：not at all, what about, why not, if only, what if...