作者:城市网 来源:城市网学院 更新日期：2013-9-3
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。
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。
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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