18.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。

　　19.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。

　　20.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。

　　21.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。

　　22.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。

　　23.It pays to + V ~~~ (...是值得的。)

　　例句：It pays to help others.

　　帮助别人是值得的。

　　24.be based on (以...为基础)

　　例句：The progress of thee society is based on harmony.

　　社会的进步是以和谐为基础的。

　　25.Spare no effort to + V (不遗余力的)

　　We should spare no effort to beautify our environment.

　　我们应该不遗余力的美化我们的环境。

　　26.bring home to + 人 + 事 (让...明白...事)

　　例句：We should bring home to people the value of working hard.

　　我们应该让人们明白努力的价值。