八年级上语法专项----主将从现一、假如主句是未来时或
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示未来含义时，那么条件和时间状语从句多用一般此刻时如：WhenIgrowup,Iwillbeanurseandlookafterpatients/Iwanttobeanurseandlookafterpatients.我长大后要当一名护士，照料病人。二、假如主句是祈使句，那么从句平时要用一般此刻时如：Don’tlaughatmewhenImakeamistake.我犯错误的时候不要笑话我。三、假如主句是含有神态动词的一般此刻时，依据需要从句多用一般此刻时如：Youshouldbequietwhenyouareinthereadingroom在阅览室时应保持寂静。四、主将从现说的是在含有时间状语从句和条件状语从句的主从复合句中，假如主句的时态是一般未来时，那么从句要用一般此刻时。比方：Iwilltellhimaboutitwhenhecomes.Ifitisfinetomorrow,wewillgoouting.五、假如主句的时态是过去未来时，那么从句要用一般过去时。比方：Hesaidthathewouldhaveanothertryifhehadthechance.Iknewhecouldhelpmeifhewasfreethenextday.主要标记有：if、unless、until、when、assoonas等注意if条件句的时态搭配：1．if从句用一般此刻时，主句用一般未来时Ifherunshe’llgetthereintime如.果他用跑的，他就会及时赶到那处。Thecatwillscratchyouifyoupullhertail.假如你拉猫的尾巴，它就会抓你。2．if从句用一般此刻时，主句用may/might/canIfthefoggetsthickertheplanemay/mightbediverted.假如雾在大一些，飞机可能就会改在其余机场下降。Ifitstopssnowingwecangoout.假如雪停了，我们就可以出去。3．if从句用一般此刻时，主句用must/shouldIfyouwanttoloseweightyoumust/shouldeatlessbread.假如你想减肥，你一定少吃面包。4．if从句用一般此刻时，主句用一般此刻时Ifyouheaticeitturnstowater.(也可用willturn)假如把冰加热，它就会化成水。4．if从句用此刻进行时，主句用一般未来时IfyouarelookingforPeteryou’llfindhimupstairs假如你是.在找彼得，上楼就会找到他。if指引的条件状语从句专项练习Ⅰ.单项选择（）1.Ifyou_____totheparty,you’llhaveagreattime.A.willgoB.wentC.goD.going（）2.I____hertheanswerifshe____me.A.cantell,willaskB.willtell,willaskC.wouldtell,askD.willtell,asks（）3.–Whatareyougoingtodotomorrow?--We’llgotothelibrarytomorrowifit___.A.isn’trainB.rainC.won’trainD.doesn’train（）4.Whatwillyoudoifyou_____totheoldfolk’shome?A.goB.wentC.goingD.willgo（）5．I’llgivethebooktohimifhe___herenextSunday.A.willcomeB.comesC.iscomingD.cameⅡ.用所给词的合适形式填空6..Ifyou________(feel)tired,you_______________(have)tohavearest.Where_______he_________(see)thefilmifhe________________(have)time?Ifthere__________(be)fewertrees,there_______________(be)morepollution.IfMarcia_____________(live)alone,she___________________(keep)apetparrot.Lana________________(buy)anewdressiftheoldone____________(be)outofstyle.12.Thetwins______________(fight)ifthey_______________(argue).I____________(have)abakesaleifI_____________(need)moneyforeducation.Peter_____________(send)meabeautifulsouvenirifhe________________(tour)Spain.I____________(go)tothebeachifit________________(notrain)thisweek.__________they__________(have)amatchifthe.EP.teacher_____________(be)busy?Ifshe____________(get)uplate,she_____________(notcatch)theearlybus.
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