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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：It 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) 例句：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。 | 
