十九、It is conceivable that + 句子
It is obvious that + 句子
It is apparent that + 句子
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 ~~~
例句：Summer is sultry. That is the reason why I dont 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...
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。
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