例:If (it is) necessary, we can give you another chance.
如果必要的話,我們可以再給你一次機會。
(3)名詞性從句中的省略
常見的是使用不定式在主動表達中省略動詞的施動者,在被動表達中省略助動詞、情態動詞等。
例:She will go to Beijing, but I don’t know how (she will go to Beijing).
她將去北京但我不知道她怎么去。
(4)定語從句中的省略
定語從句中也常使用不定式作為省略的手段;當用as引導非限制性定語從句時,常省略系動詞。
例1:All tests require a potential candidate with whom (the tests) to compare DNA.
所有的測試都需要一個潛在的對象,從而可以將DNA與其比較。
例2:He gave the same answer as (he had given) before.
他給出的答案和以前一樣。
三、真題舉例
However , it has been found that even people insensitive to a certain smell at first can suddenly become sensitive to it when exposed to it often enough . (05,完型)