(1)主语(subject)
主语指句子所谈论的主题，作主语的通常是名词、代词，也可以是数词、doing、to do或者主语从句。
[1]The_efforts_you_make are sure to pay off sooner or later.
你的努力迟早会有回报的。
[2]We can take advantage of this opportunity to strengthen the relationship between the two companies.
我们可以利用这次机会来加强两个公司之间的联系。
[3]Four_and_five is nine.四加五等于九。
[4]What_you_need_is more practice.你需要的是更多的练习。
[特别提示] 动词不定式、动名词或者从句作主语时，常用it作形式主语，而把真正的主语后置。
[5]To_see such a serious man play jokes on us is amazing.
＝It is amazing to_see such a serious man play jokes on us.
看到这么严肃的一个人开我们的玩笑，真令人吃惊。
