While waiting / he was waiting there,he saw two pretty girls come out of the building.
If not / he is not invited,he won't go to your birthday party.
3.在时间、地点、条件、让步等状语从句中,从句主语与主句主语一致或从句主语是it,其后动词是be时,可省去“主语+be” 部分。如:
When (he was)still a boy of ten,he had to work day and night.
If (it is)necessary,I'll explain it to you again.
4.表示“除了”的介词but前若有实义动词do/does/did/done,后面的动词不定式不带to。如:
I could do nothing but wait there.
介词but前若没有动词do及其变化形式,后面的不定式带to。如:
We had no choice but to obey the rules.
【典例分析】(2010·全国高考)Though ______ to see us,the professor gave us a warm welcome.
A.surprising
B.was surprised
C.surprised
D.being surprised
答案为C项。所选词的逻辑主语是the professor,故用surprised表示“惊讶的”。surprising意为“令人惊讶的”,不合句意。此处Though surprised to see us是状语从句Though he was surprised to see us的省略。
(2009·江苏高考)—What's the matter with Della?
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