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1.ago ［误］Tomsfatherhasbeendeadfiveyearsago. ［正］Tomsfatherdiedfiveyearsago. ［析］ago意为由说话时算起，若干时间以前。它只能和一般动词过去时连用，而不要与完成时连用。 ［误］YesterdayImetafriend.Wedidntseeeachotherforalongtimesinceweleftthecollegetwentyyearsago. ［正］YesterdayImetafriend.Wehadntseeneachotherforalongtimesinceweleftthecollegetwentyyearsago. ［析］要注意的是在本句ago是用在由since引起的从句之中，只是从句应用过去时，但不影响主句的时态。 2.agree ［误］Doestheteacheragreetous? ［正］Doestheteacheragreewithus? ［误］Doesheagreewithourplan? ［正］Doesheagreewithus? ［析］agreewith指同意某人的提议、建议、计划等。如果要讲同意某项计划则要用agreeto,如：Doyouagreetotheplan? 3.all ［误］Theoldmanhastwosons.Allofthemareworkers. ［正］Theoldmanhastwosons.Bothofthemareworkers. ［析］all是指三者或以上的全部，而both则是指两者都。 ［误］Theallchildrenareplayingfootballnow. ［正］Allthechildrenareplayingfootballnow. | 
