一、 the + est + 名词 + (that) + 主词 + have ever + seen ( known/heard/had/read, etc)
　　the most + 形容词 + 名词 + (that) + 主词 + have ever + seen ( known/ heard/ had/read, etc)
　　例句：Helen is the most beautiful girl that I have ever seen.
　　海伦是我所看过较美丽的女孩。

    二、be + forced/compelled/obliged + to + V (不得不...)
　　例句：Since the examination is around the corner, I am compelled to give up doing sports.
　　既然考试迫在眉睫，我不得不放弃做运动。

    三、It is conceivable that + 句子 (可想而知的)
　　It is obvious that + 句子 (明显的)
　　It is apparent that + 句子 (显然的)
　　例句：It is conceivable that knowledge plays an important role in our life.
　　可想而知，知识在我们的一生中扮演一个重要的角色。

    四、That is the reason why (那就是...的原因)
　　例句：Summer is sultry. That is the reason why I don't like it.
　　夏天很燠热。那就是我不喜欢它的原因。 

    五、For the past+ 时间，S + 现在完成式...(过去...年来，...一直...)
　　例句：For the past two years, I have been busy preparing for the examination.
　　过去两年来，我一直忙着准备考试。

    六、Since + S + 过去式，S + 现在完成式。
　　例句：Since he went to senior high school, he has worked very hard.
　　自从他上高中，他一直很用功。

    七、It pays to + V (...是值得的。)
　　例句：It pays to help others.
　　帮助别人是值得的。

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