AEIS考试前我们最重要的就是做好AEIS备考工作，不过很多考生花费了大量的时间和精力，最终备考效果却不尽如人意，这是为什么呢？其实这是没有找对备考方法的原因，本文我们一起来说说AEIS语法的虚主语知识点！

　　Writers, especially beginning writers, are often cautioned against using passive voice in their writingbecause its use slows down the pace.

　　由于被动语态会影响节奏，作者们(特别是初学者)经常被警告不要使用它。

　　Another construction that can make your writing plod is the dummy subject.

　　还有一种结构也会让你的文章变得拖沓，它就是虚主语。

　　When we use the words it and there to begin a sentence without a referent (a noun the pronoun is referring to), we’re using a dummy subject.

　　虚主语是指句子开头的it或there没有指代物(it、there指代的名词)。

　　In this pair of sentences:

　　下面两个句子中：

　　I went to see Fantastic Four 2 over the weekend. It was fun, but mostly forgettable.

　　“It” refers to the movie Fantastic Four 2. The pronoun has a referent.

　　It指代电影《神奇四侠2》。这个代词有指代物。

　　In this sentence, however:

　　但这个句子里：

　　It is apparent that oil reserves will be exhausted by 2050.

　　“It” has no referent, and is therefore a dummy subject.

　　It没有指代物，因此它是虚主语。

　　The same thing happens frequently with there:

　　这种情况也经常发生在there开头的句子上：

　　There are several ways in which you could begin.

　　There are five stages of grief.

　　Dummy subjects are just one of many problems that weaken your writing by making it vague, fuzzy, and indefinite. The sentences above can be reconstructed with stronger, more definite subjects:

　　虚主语是让你的文章变得含糊不清的诸多原因之一。上面的句子可以用更有力、更明确的主语加以改写：

　　Some experts warn that our oil reserves will be exhausted by 2050.

　　You could begin in one of the following ways: (followed by a list).

　　Elisabeth Kubler-Ross identified five stages of grief in her book On Death and Dying.

　　In general, unless you don’t know who is performing an action, or you want to emphasize the action of the sentence for some reason, you should avoid dummy subjects.

　　以上就是AEIS语法的虚主语知识点，希望大家根据自身情况制定合理的复习计划，同时小编提醒大家，在备考中千万不能忽略真题的训练！如果想要了解更多关于AEIS程度要求、AEIS必背单词的信息，可以在线咨询我们或添加客服微信kewo11！