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。
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