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十九、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。
二十、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。
二十一、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。
二十二、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。
二十三、It pays to+V-(……是值得的。)
例句：It pays to help others.
帮助别人是值得的。
二十四、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。
二十五、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。
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