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as if和as though引导的从句所叙述的情况与事实相反时，从句的谓语动词多用虚拟语气。在虚拟语气结构中，用________时态来表示现在的情形；用________时来表示过去的动作或状态；用________时表示正在进行的动作；用________时表示将要发生的动作。
当as if和as though从句的主语和主句主语一致，且从句中含有系动词be的某种形式时该主语和系动词可以省略。
例如：John paused as if(he was)expecting Mary to speak．
选择出对句子画线部分结构描述正确的选项
My mother keeps telling me not to take them because they are dangerous．
A．主语
B．表语
C．宾语
D．状语
Choose the right description of the part of sentence underlined．
(选出对句子画线部分结构描述正确的选项。)
It seemed that the world was at an end!
A．主语
B．表语
C．宾语
Cases of panic buying of salt ___________ on rumors ___________ it can help prevent the effects of radiation have been seen in Mainland China, Hong Kong, Macau, Taiwan and parts of the US. 【黑龙江省哈市五县2011年高考模拟试卷英语卷（22）】【非谓语动词】
A. based, which B. basing, that C. based, that D. to be based, what
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Inception, which cost ＄150-million-plus US to make, earned a healthy ＄76 million US at the box office world wide during its opening weekend, ____ that epic and sci-fi aren’t necessarily mutually exclusive in the movie industry. 【江西八校2011年高三联考】【非谓语动词】
A. to prove B. prove C. proving D. proved
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