解放军文职考试：连词+过去分词

　　He won't go there with us unless (he is) invited.除非受到邀请,否则他不会和我们一道去那里。

　　The concert was a great success than (it was) expected.这场音乐会出乎意料地取得了巨大成功。

　　连词+不定式

　　He stood up as if (he were) to say something.当时他站起来好像要说什么。

　　He wouldn't solve the problem even if (he were) to take charge.即使他来负责,他也解决不了这个问题。

　　连词+介词短语

　　She looked anxious as though (she was) in trouble.她看上去很焦急,好像遇到了麻烦。

　　He had mastered the English language before (he was) in the USA.他到美国之前就懂英语了。

　　解析：当从句主语和主句主语不一致时,从句部分要么用完全形式,要么用独立主格结构来表达，不能用其他形式表达。

　　When the meeting was over, all the people went out of the meeting-room.当会议结束时,人们都走出了会议室。=The meeting over,