if he studied harder中为什么要用studied而不是studys

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if he studied harder中为什么要用studied而不是studys if i studied harder和 if i had studied harder 语义上有何差别 If he ________ harder,he will catch up with us soon.A.study B.studies C.will study D.studied Father promised that if I studied harder he would take me to Beijing next summer.that不能省略吗?可是,那道题只选that if,不选if.Why? He studied hard so that he could catch up with other(改为同义句)He studied harder ____ ____ ____ He studied harder so that he could catch up with pthers的同义句He studied harder ( )( )( )catch up with others If we often () a person,he'll work harder If Tom have studied harder before,he____(pass)the examination last week.是would pass么?还是别的? 同义句转换 I need your help badly!He studied harder so that he could catch up with others. He studied harder ____ ____ _____ catch up with others.(每空一词) 宾语从句中的引导词that何时不能省略?请看例题:1.Father promised ______ I studied harder he would take me to Beijing.A.if B.that if为何选B不选A?2.Father promised ______ he would take me to Beijing if I.A.that B./ 是否AB都对 He _________ harder this year than last year.A.study B.studies C.was studying D.studied选哪个?为什么? if he had worked harder,he would have succeeded,这里为什么要用would have succeded? -How I wish I had studied harder when Iwas in senior shool!-If you had,you (would be) a university student now.括号中何解? 谢if you had taken your medicine yesterday,you ____ well now.a would have beenb should be c woule be d will beif you ____ harder,you ____ tomorrow'exam.a studied ; will passb studied; would have passedc had studied; would passd had studied; woule ha 英语的句型转换 Mr Li lived here three years ago.( 改为现在完成时)Mr Li ( )( )here ( )( )three years .He studied harder so that he could catch up with others.(同义句)He studied harder ( )( )( )catch up with others.I am in great need o After that the children studied ( )harder()中应填very还是even If he ___ harder next time,he will catch up with us.A.workedB.will workC.worksD.work I do not know what I should do.(同义句) He studied harder so that he could catch up with others.I am in great need of your help.(同义句)