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、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。
三、It pays to + V ～(……是值得的)
例句：It pays to help others.
帮助别人是值得的。
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。
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
