1、Unit 2Poems 第四学时 Grammar虚拟语气在主从复合句中的用法1虚拟语气在主语从句中的用法(1)在It is important(strange，natural，necessary)that.句型里，that所引导的主语从句中的谓语动词常用(should)动词原形。It is important that every member(should)know these rules.重要的是每个成员都(必须)知道这些规则。It is necessary that he(should)_be sent there at once.有必要马上派他到那里去。It is very stran
2、ge that she(should)_have left without saying goodbye.她不辞而别，真让人奇怪。(2)It is demanded/required/suggested.thatclause，从句谓语用“should动词原形”。It is decided(has been decided)that the meeting(should)be postponed(延期)till tomorrow.It was required that each student(should)_bringenough food on the trip.2虚拟语气在宾语从句中的用
3、法在suggest(建议)，propose(建议)，demand(要求/需要),request(要求/请求)，desire(请求/期望)，order(命令)，command(命令)，insist(坚持)等动词后的宾语从句中，谓语动词用“(should)动词原形”，表建议、要求、命令。Professor Wang suggested that we(should)notoveruse our eyes and take more outdoor activities.王教授建议我们不要过度用眼及多参加室外活动。提示：wish宾语从句：表示不能实现的愿望或美好的愿望，表示“但愿；就好了；可惜；多好
4、”。(1)表示现在不能实现的愿望，从句的谓语动词用过去式，表虚拟语气。I wish(that)I were_young again.要是我能返老还童就好了。How I wish I were ten years younger.我多么希望自己能年轻10岁。(2)表示过去不能实现的愿望，从句的谓语动词用had done/would(could)have done。We wish we had_arrived there two hours earlier.我们要是早两个小时到达那儿就好了。I wish I had_met him yesterday.真希望昨天遇见他。(3)表示将来不能实现的愿望
5、，从句的谓语动词用would(could)动词原形/were to动词原形。I wish I could_fly to the moon one day.但愿将来某一天我能飞上月球。I wish it should_be fine tomorrow.我希望明天是晴天。3虚拟语气在同位语从句中的用法demand，suggestion，proposal等名词带有同位语从句时，其谓语动词要用虚拟语气，即(should)动词原形。The suggestion that_the_plan_(should)_be_delayed(延迟)will be discussed tomorrow.推迟那项计划的建
6、议将在明天讨论。4虚拟语气在状语从句中的用法由as if或as though引导的状语从句表示比较或方式。He treats me as if I were a stranger.他把我当陌生人。She talked about the film as if she had_really_seen it.她谈论那部电影的神情就好像她真的看过一样。结论：表示与现在相反的情况，从句谓语形式为动词的过去式(be用were);表示与过去相反的情况，从句中的谓语动词用“had过去分词”。5虚拟语气在表语从句中的用法My demand is that you should_get_up at six.我的
7、要求是你应六点起床。His order is that all of us should_get there before 5 oclock.他的命令是我们大家五点前到达那里。6在in order that或 so that引导的目的状语从句中，谓语动词多用could/might/should动词原形Mr.Green spoke slowly so that his students could/might_hear clearly.为了让学生听明白，格林先生说得很慢。7在in case，for fear(that)，lest (以免，万一)等引导的从句中，谓语动词用should动词原形She
8、 took her raincoat with her in case/for fear that/lest she should_be_caught in the rain.她带上雨伞以免淋雨。Remind me of it in case I should_forget.记得提醒我，以防我忘记了。8在带有even if/even though引导的让步状语从句中的用法Even if Lin Tao were here，I should_say the same thing.即使林涛在这儿，我也会这样说。Even though he had_been ill，he would_have_go
9、ne to his office.即使病了，他仍会去上班。9虚拟语气在定语从句中的用法It is(about/high)time主语过去式/should动词原形。It is(about)time our team won.我们队该赢了。It is high time that we had a party.我们该举行晚会了。10虚拟语气其他常见句式(1)If only (要是就好了)的用法。表现在的强烈愿望：动词用过去式；表过去的强烈愿望：动词用过去完成时；表将来的强烈愿望：动词用would/could动词原形。If only I could learn English well in one
10、 day.(现在)要是我一天能学会英语就好了！If only I had_not_been late for the interview that day！(过去)那天面试我要是没迟到该多好啊！If only he would_reply.(将来)他如能回复该多好！(2)would rather(宁愿，宁可)后接从句，动词用虚拟语气。表与现在事实相反的愿望：动词用过去式；表与过去事实相反的愿望：动词用过去完成时。I would rather she were not present.我宁可她不在场。(事实上她在场，现在前提)I would rather he had_told me the t
11、ruth.我宁可他告诉我事实真相。(事实上他没告诉我真相，过去前提)11在其他句型中的用法(1)Without air，there would_be no living things.没有空气，就没有生命。(2)But for your help，I could_not_have_done it.要不是你帮忙，我做不好这件事。(3)May you succeed!祝你成功！(4)Long live the Chinese Communist Party.中国共产党万岁！(5)Be careful when crossing the street，otherwise/or you would be hurt.过马路时要小心，否则你可能会受伤的。
