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1、if条件状语从句和宾语从句She is doing her homework.Ifyouarehard-working,youwillgetgoodgrades.She gets good grades. If 引导条状语从句时，从句中用一般现在时代替一般将来时。1. If he _(go) to the movies,he wont finish his work.goes 2. If I _(become) a doctor,I can help others. become3. If we _(have )time, we will go to the park tomorrow.hav
2、e4.如果你去，如果你去， 我也去。我也去。If you go,I will go.5.如果明天下雨，请带雨衣如果明天下雨，请带雨衣。 raincoatPlease take a raincoat if it rains.If you are free this weekend,what will you do ?If I am free ,sleepwatchTVplaycomputergamespracticeIfyouwanttogetgoodmarks,dowhat?Dontdowhat?Ifyouwanttogetgoodmarks,_.Ifyouwanttogetgoodmarks
3、,dont_.studyhardlistentoteacherscarefully.dohomeworkbyyourself.copyyourhomework.talkintheclasscheatintheexamsIf 条件句的替代形式：条件句的替代形式：（1）祈使句祈使句 + and/or + 陈述句陈述句（谓语动词通常用将来时态）（谓语动词通常用将来时态）。其中，。其中，and表示句意顺承；表示句意顺承；or表示转折，意为表示转折，意为“否则否则”。e.g. If you work hard, youll pass the exam easily. = Work hard, and y
4、oull pass the exam easily.If you dont work hard, youll fall behind others. = Work hard, or youll fall behind others.（2）用介词）用介词with, without的替代形式：的替代形式： e.g. If there is no water, the fish may die. = Fish may die without water. If you help me, Ill finish my task on time. =With your help, Ill finish m
5、y task on time.If在宾语从句中翻译为在宾语从句中翻译为“是否是否”If在条件状语从句中翻译为在条件状语从句中翻译为“如果如果”IllgotoseeyouifIamfreenextweek.Iwanttoknowifheisateacher.whether1.if在句中的含义不同在句中的含义不同2.if在从句中的位置不同在从句中的位置不同If引导的宾语从句放在主句之后；而引导的宾语从句放在主句之后；而if引引导的状语从句可放在主句之前也可放在主导的状语从句可放在主句之前也可放在主句之后句之后=Ifitdoesntrain,Iwillgoouttomorrow.Iwillgoout
6、tomorrowifitdoesntrain.Idontknowifthetrainhasarrived.If引导的条件状语从句放于句首时多用逗号隔开；引导的条件状语从句放于句首时多用逗号隔开；而而if引导的宾语从句则不能。引导的宾语从句则不能。3.时态要求上有区别时态要求上有区别If引导条件状语从句的时态为一般现在时引导条件状语从句的时态为一般现在时记住记住“主将从现主将从现”1.Iwanttoknowifthereasportsmeetingnextmonth.doesnt rainwill be2.Ifitdoesntrain,wellgooutIf引导的宾语从句的时态由主句及本身时引导
7、的宾语从句的时态由主句及本身时态决定；态决定；1.Canyoutellmeifshecancometothemeeting?2.Shewillnotgothereifitisrainytomorrow.3.Icantguessifshewillbeangry.4.Ifwehelpeachother,wewillgetgoodresults.1 If I _(not understand）, I will ask my teacher for help .2If I _(copy ) your homework , I will cheat myself .3I dont know if it
8、_ (rain) tomorrow.4My teacher asked me if I _ (finish) my homework already. dont understand copywill rain had finishedif的用法的用法2.引导条件状语从句：引导条件状语从句：译为译为“如果，假如如果，假如”(1)if从句从句+祈使句祈使句(2)if从句从句+主句（一般将来时）主句（一般将来时）(3)if从句从句+主句（含有情态动词）主句（含有情态动词）1.引导宾语从句引导宾语从句：译为：译为“是否是否”，表示不确定的概念。时态特征为：宾，表示不确定的概念。时态特征为：宾语从句的时态一致性（主过从过，主现从自由）语从句的时态一致性（主过从过，主现从自由）Ididntknowifyourfathercouldcometogether.Canyoutellmeifmissyourparents?结束语结束语谢谢大家聆听！谢谢大家聆听！17
