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IfitwereSundaytomorrow,Iwouldgoandseemyfriends.明天要是星期天的话，我就去看望我的朋友。IfIwereyou,Ishouldgoandtry.我要是你，我就去试试。Ifwisheswerehorses,beggarsmightride.如果幻想能成为马匹，叫花子都有了坐骑Iwouldgoiftheytreatedmelikeaslave.要是他们把我当奴隶对待，我就走。IfIhadknownyourtelephonenumberyesterday,Iwouldhavetelephonedyou.如果昨天我知道你的电话号码，我就给你打电话了。Ifithadnotrainedthismorning,Ishouldhavegoneshopping.今天早上要是没下雨，我就去买东西了。Thefloodmighthavecausedgreatdamagestothepeopleifwehadnotbuiltsomanyreservoirs.倘若我们没有修建这么多的水库，洪水就会使人民遭受巨大的损失。Ifhewereheretomorrow,Iwouldspeaktohim.明天如果他在这里的话，我就和他谈谈。Ifyoudroppedtheglass,itwouldbreak.你要是把杯子掉下来，会打碎的。Ifshehadtime,shecouldhelpme.她要是有时间，就会帮我了。IfIweretodothework,Ishoulddoitinadifferentway.要是我做这项工作，我就会以不同的方式去做。Iftheheadmasterweretocome,whatwouldwesaytohim假如校长来了，我们对他说什么呢？Wereitnecessary,Imightgowithoutdelay.如果需要的话，我可以立即去。（=Ifitwerenecessary......）Hadyoutakenmyadvice,youwouldn'thavefailedintheexam.你要是听了我的建议，就不会考试不及格了。（=Ifyouhadtakenmyadvice......）ShouldIhavetime,Iwouldcallonher.要是有时间，我就去看她。（=IfIshouldhavetime......）Ifyouhadn'twatchedTVyesterday,youwouldn'tbesosleepynow.如果你昨天不看电视，你现在也就不会这么困了。（从句yesterday说明过去，主句now说明现在）Iftheyhadlefthomeearlythismorning,theywouldarriveinhalfanhour.如果他们今天一早就离开家的话，再过半小时他们就该到了。（从句说明过去，主句说明将来。）Ifyouhesitatedthismoment,youmightsufferinthefuture.如果你此刻犹豫不决，你将来会吃苦头的。（从句说明现在，主句说明将来）Hewouldnotgetsucharesultwithoutyourhelp.没有你的帮助，他就不会有今天的成果。(条件暗含在介词短语withoutyourhelp中)Butforyou,Icouldnotberecoveredsosoon.要不是有你，我就不会恢复得这么快。(条件暗含在Butforyou中)Thissamething,happeninginthepast,wouldleadtoadisaster.同样的事，如发生在过去，就会酿成大祸。(条件暗含在分词短语happeninginthepast中)Hemusthavebeenthere,orhenevercouldknowtheplacesowell.他一定是去过那儿，否则他绝不会对那个地方如此熟悉。(暗含条件是连词or)Shewasill,otherwiseshewouldhavebeenpresentatthemeeting.她病了，否则的话就会出席会议了。（条件通过连词otherwise/or表示出来Ifshehadnotbeenill...）Itoldhimtogotherehimself,butperhapsIshouldhavegonetogetherwithhim.我让他自己去那里，但也许我应该和他一道去。（连词but暗示条件）Supposeyouwereinmyshoes,whatwouldyoudo假若你站在我的立场上，你会怎么办？（用suppose/supposing/providing等词表示if）Totalkwithher,youwouldknowshecouldnothearwell.如果你同她交谈，你就会知道她的听力不好。（动词不定式带有假设的意思，相当于Ifyoushouldtalkwithher...）Lefttohimself,hecouldnothavefinishedthework.要是放任他的话，他是不可能完成工作的。（动词的-ed形式表示条件Ifhehadbeenlefttohimself...）Itisimportantthatwe(should)workoutastudyplan.重要的是我们要制订出一个学习计划。Itwillbebetterthatwe(should)meetsomeothertime.最好我们在另一个时间见面。Itissuggestedthateachstudent(should)singasonginEnglish.有人建议每个学生都要唱一首英文歌曲。Itisdemandedthatheshouldleaveatonce.要求他立刻离开。Itisstrangethatheshouldhavefailedtoseehisownshortcomings.真奇怪他竟看不到自己的缺点。Itisapity/shamethatIshouldbeatschoolinsteadoflyinghereinhospital.真可惜，我应当在学校而不是躺在医院里。Itisnaturalthatyoushouldforgetitfirst.你起先记不住是很自然的。Theexaminationinstructoraskedthatthestudents(should)notuseacalculator.考官要求学生不要使用计算器。Theworkersdemandedthattheirwages(should)beraisedby10percent.工人们要求增加百分之十的工资。Theyrequestedthathe(should)singasong.他们要求他唱一首歌。Hissilencesuggestedthatheagreedwithmydecision.他的沉默暗示他赞同我的决定。（暗示）HesuggestedthatI(should)sticktomydecision.他建议我坚持自己的决定。（建议）Heinsiststhatdoingmorningexercisesdoesgoodtopeople'shealth.他坚持认为做早操对健康有益。（强调）Heinsiststhathe(should)domorningexerciseseveryday.他坚持每天都要做早操。（要求）IwishIwereabird.但愿我是一只小鸟。IwishIknewtheanswer.我要是知道答案就好了。Iwishshehadtakenmyadvice.那时她要是接受我的建议就好了。IwishthatIhadseenheryesterday.真希望我昨天见过她。Iwishyouwouldstayanhourlonger.我希望你再呆一个小时。Iwishitcouldstopraining.但愿雨能停。Thestudentshopethattheirfootballteamwillwinthegame.学生们希望他们的足球队获胜。（可能实现）IwishIcouldseehimnow.我希望现在就能看到他。（不可能实现）Myadviceisthatyou(should)practisespeakingEnglishasoftenaspossible.我的建议是你尽可能经常地练习说英语。Thedemandisthatthecomposition(should)bewrittenononesideonly.按照要求作文必须单面誊写。Itismydesirethatallthemembersofthefamily(should)gatheronceayear.我的愿望是所有家庭成员一年团圆一次。Thesuggestionthateducation(should)bereformedisreasonable.教育要改革的建议是合理的。Theteachertreatsthepupilasifhewereherownchild.这位老师对待这位学生就像自己的亲生孩子一样。（这位学生并不是她的亲生孩子）Ifeltasthoughwehadknowneachotherforyears.我感觉我们好像认识多年了。（其实并没有认识多年）Itlooksasifitmightrain.天看上去好像要下雨。（不大可能下雨）Helooksasifheisyoung.看样子他好像很年轻。（他就是年轻）Helooksasifhewereyoung.看样子他好像很年轻。（实际上他不年轻）PleaseremindmeofitagaintomorrowincaseI(should)forget.请你明天再提醒我这件事，以免我忘记。Sheemphasizeditagainandagain,lesthe(should)forget.她一再强调这一点免得他忘记。Wehadameetingandtalkedthematteroverfacetofaceforfearthatthereshouldbeanymisunderstanding.我们开了一个会，面对面谈了这件事，以免发生任何误会.IshallwritedownyourtelephonenumbersothatImaynotforget.我要把你的电话号码记下来，以免忘记。Theyworkedharderthanusualinorderthattheycouldfinishtheworkaheadoftime.为了能提前完成工作，他们比往常更加努力。Wewilltellyouthetruthsothatyoucanjudgeforyourself.我把真实情况告诉你，使你能自己作出判断。Thoughhe(should)fail,therewouldstillbehope.即使他失败了，仍有一线希望。Ishouldsaythesamethingevenifhewerehere.即使他在这里，我还是要这么说。Whetherhe(should)succeedorfail,weshallhavetodoourpart.不管他成功还是失败，我们还是要做好自己的事。Howeverharditmightrainrains,weshallgotheretogether.不管雨下得多么大，今晚我们还是要去那里。Nomatterwhathissocialposition(might)be,amanisequalintheeyeofthelaw.一个人不论其社会地位如何，在法律面前都是平等的。Itistimethatthechildrenwenttobed.到孩子们睡觉的时间了。Itishightimethatwebeganthemeeting.正是我们开会的时间了。Ifonlyheknewtheanswer.他要是知道答案就好了。（用过去时表示现在）IfonlyIcouldspeakseveralforeignlanguages！我要是能讲几种外语就好了！（用would/could表示将来）I