21、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。
22、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。
23、It pays to+V~(....是值得的)
例句: t pays to help others.帮助别人是值得的。
24. 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。
25、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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