语法知识—虚拟语气的图文解析
虚拟语气(19张PPT)初中英语专项复习课件
My suggestion that we (should) have a meeting has been accepted by others.
We all agree to that suggestion that the meeting (should) be put off.
If I had known his telephone number, I would have called him. 如果明天下雨的话，我们会取消比赛．
If it should \were to rain, we would call off the match.
使用虚拟条件句要注意的几点：
China.
A.would be B. has been C. should be D.was
5. He is talking so much about America as if he ___A__ there.
A.had been
B. has been
C. was
D. has gone
6. The young man insisted that he __B___ nothing
I would rather you told me the truth. I would rather you had gone there last Sunday.
4. as if ( as though) 看起来 常用虚拟形式，即 表示与现在事实相反，用过去式；与过去事实相反 用过去完成式 (had done).
虚拟语气
初中英语专项复习
虚拟语气讲解课件ppt.ppt
虚拟语气
虚拟语气在：在宾语从句中
[例句]
1. I wish she would be on my side. 我希望她能站在我一边。
2. I wish I were 10 years younger. 我但愿自己能年轻十岁。
3. I wish (that) you would get a good job. 我希望你能找到一个好职业。
• He insisted that he was right. 他坚称他是正确的。
认识到了贫困户贫困的根本原因，才 能开始 对症下 药，然 后药到 病除。 近年来 国家对 扶贫工 作高度 重视， 已经展 开了“ 精准扶 贫”项 目
虚拟语气
虚拟语气在：在宾语从句中
• 在would (had) rather(宁愿) 引导的宾语从句中
[例句] • It’s necessary that we should have a walk now.
我们有必要出去散散步。
• It’s natural that she should do so. 她这样做是很自然的。
1. It’s important that we should take good care of the patient. 重要的是我们要照顾好病人。
一、在条件从句中 (叫虚拟条件句)，表示与事实相反 的条件。分三种情况(以 do 为例)：
认识到了贫困户贫困的根本原因，才 能开始 对症下 药，然 后药到 病除。 近年来 国家对 扶贫工 作高度 重视， 已经展 开了“ 精准扶 贫”项 目
虚拟语气
虚拟语气在 在条件从句中
[例句]
• If you had come a few minutes earlier, you would have met him.
高考语法——非真实条件虚拟语气(24张PPT)
•9、要学生做的事，教职员躬亲共做；要学生学的知识，教职员躬亲共学；要学生守的规则，教职员躬亲共守。2021/8/282021/8/28Saturday, August 28, 2021 •10、阅读一切好书如同和过去最杰出的人谈话。2021/8/282021/8/282021/8/288/28/2021 4:15:52 AM •11、只有让学生不把全部时间都用在学习上，而留下许多自由支配的时间，他才能顺利地学习……（这）是教育过程的逻辑。2021/8/282021/8/282021/8/28Aug-2128-Aug-21 •12、要记住，你不仅是教课的教师，也是学生的教育者，生活的导师和道德的引路人。2021/8/282021/8/282021/8/28Saturday, August 28, 2021
If he had hurried, he could have caught the train.
3.如果你昨天告诉他，他也许会提些建议了。
If you had told him yesterday, he might have made some suggestions.
4. 假如我要出国，我就会去法国。
2. 与过去事实相反
But for/Without …, 主语 would/could/might/should have done sth.
Without\But for\If it hadn’t been for your help, I wouldn’t have passed the exam.
高中英语高考高考英语语法总复习课件：虚拟语气 (共82张PPT)
【例11】 When a pencil is parted in a glass of water, it looks as if it _____(break)_. 【例12】 Eliza remembers everything exactly as if it ______ (happen)yesterday.
主句 would/should/could/might
If he didn’t come tomorrow, we would put off the meeting.
主过将从过， 主过将完从过完 would do/did would have done/had done
【例1】 If we ______ (take)the other road, we might have arrived here in time for the meeting.
【例13】 Look at the terrible situation I am in! If only I ______ (follow)your advice. 知识扩展：follow/take sb's advice
【例13】 Look at the terrible situation I am in! If only I had followed (follow)your advice. 知识扩展：follow/take sb's advice
做题时注意：动词的形式根据它所表示的时间作出相应的调整
一分为二，先找时间再判断时态。
【例4】
If we ______ （book）a table earlier, we couldn’t be standing here in a queue.
虚拟语气公开课全PPT课件(模板)
80%
例句
If I were you, I would study harder.（如果我是你，我会ቤተ መጻሕፍቲ ባይዱ努 力学习。）
过去时条件句虚拟语气
基本结构
If + 主语 + had + 过去分词， 主语 + would/should/could/might + have + 过去分词
03
情态动词的疑问句形 式错误
在构成疑问句时，应将情态动词放在 句首，而不是将助动词“do”放在句 首。例如，“你能来吗？”应表达为 “Can you come?”，而不是“Do you can come?”。
THANK YOU
感谢聆听
虚拟语气在从句中的运用技巧
名词性从句中虚拟语气使用规则
虚拟语气在主语从句中的应用
当主语从句表达的是与现在事实相反的情况时，谓语动词用一般过去时。
虚拟语气在宾语从句中的应用
当宾语从句表达的是与现在事实相反的情况时，谓语动词用一般过去时或过去完成时。
虚拟语气在表语从句和同位语从句中的应用
当这些从句表达的是与现在事实相反的情况时，谓语动词用一般过去时。
定语从句中虚拟语气使用规则
虚拟语气在定语从句中的应用：当定语从句表达的是与现在事实 相反的情况时，谓语动词用一般过去时或过去完成时。
需要注意的是，定语从句中的虚拟语气通常出现在“as if”或 “as though”引导的从句中。
状语从句中虚拟语气使用规则
虚拟语气在条件状语从句中的应用
当条件状语从句表达的是与现在事实相反的情况时，谓语动词用一般过去时或过去完成 时。
高中英语之虚拟语气详细讲解
虚拟语气（1）——倒推时态类定义：虚拟语气是一种动词形式，有两种意思 1.表示说话人所说的不是事实，而是一种假设、猜测、怀疑等（非真实条件状从和让步状从）2.表示说话人的愿望、要求、命令、建议（名词性从句：主宾表同）使用情景 1.用来表达一个假设或纯粹的意愿（与事实相反或不太可能实现）（如果我是宇航员，我要在月球上跳舞）2.用来缓和语气，使句子更委婉、礼貌、得体（如果你能接受我的邀请，我将不胜感激）3.表示烦恼、不耐烦等情绪（你要是能考上大学，全家都烧高香了）4.表示适度的责备或批评（如果你那时更耐心点，现在我们都成功了）5.表示美好的祝愿或祝福（祝你成功）1.虚拟条件句一般虚拟条件句混合虚拟语气（错综时间条件句）定义：条件状语从句表示的行为和主句表示的行为发生的时间不一致例子：If you had followed my advice, you would be better now.如果那时你听了我的建议，现在已经好了If it hadn’t been for you, I would have to make another trip there tomorrow.如果不是你的话，我明天还要再走一趟。
If you had studied hard before,you would be a college student now.如果你以前努力学习的话，你现在就是大学生了。
省略+倒装当虚拟条件句的谓语动词中含有were，should，had时，if可以省略，并将were,should,had提前于句首，变为倒装句。
如果虚拟条件句是否定句，not 保留在原处If he should agree to go there, we should send him there.= Should he agree to go there,we should send him there.If she were there,she would agree with us.= Were she were, she would agree with us.If he had learnt about computers,we would have hired him.= Had he learnt about computers,we would have hired him.含蓄虚拟条件句定义：有时为了表达的需要，在虚拟语气中并不总是出现if引导的条件状语从句，而是通过其他手段来代替条件从句分类：1) but for....=(If it+be not for) ；without；Without your help ,we couldn’t have finished the work ahead of time.= But for your help,we couldn’t have finished the work ahead of time.= If it hadn’t been for your help,we couldn’t have finished the work ahead of time.没有你的帮助，我们不可能完成任务。
虚拟语气等语法.pptx
3. 用在主语从句中。其结构通常为： “It is + 形容词 that….” -- It is necessary that you (should) be present at the meeting. 类似的这类形容词有： advisable, essential, important, natural, possible, strange, urgent, vital…
airport. 1. 倒装句：→ Were Lunxun alive, how happy…
→ Should it rain tomorrow, ….
第4页/共26页
2. 错综条件句 1）If I were you , I would have taken his advice then. 2) If he had listened to me, he would not be in such trouble now.
七、It is (about, high) time… -- It is high time that we began to work, -- It is (about) time that children went to
school.
八、would rather, would sooner引导的从句中
独立主格结构基本结构:名词+分词;有时用with 引导
◆ After they settled 第t2h0e页/共q2u6页estion, they went
同位语从句
同位语从句：对名词作进一步补充说明，是补 充说明前面名词的具体内容。
there. (注：如果主句的谓语动词为系动词，如：appear, seem, feel, smell, taste等，从句一般用陈述句。） -- She looks as if she is going to cr y.
高考英语语法考点总结——虚拟语气(共27张PPT)
C. was
D. has been
考点3：as if/as though问题
as if/as though表示不可能实现的事情时，用虚拟 语气；表示很有可能实现的事情或较大的可能性时， 用陈述语气。
A The sky is covered with black cloud. It looks as if
考点2：if only
在if only感叹句中, 表示“但愿”，“要是……就好 了”。
D If only the committee
the regulations and put them into
effect as soon as possible.
A. approve B. will approve C. can approve D. would approve
If they ____ earlier than expected, they ____ here now.
A. had started, would be B. started, might be C. had started, would have been
A
D. will start, might have been
当上述表示建议、命令的动词以其名词形式出现，并 且被用作主语，引导一个表语从句或者同位语从句时， 谓语动词用should+动词原形，should可以省略。
B My advice is that_____________ till next week is reasonable.
A.she waits B. she wait C. wait she
It is requested by the hotel manager that radios o’clock at night.
虚拟语气PPT课件
与过去事实相反
使用“if”引导从句，动词用“had+过 去分词”。例如：“If I had known the answer, I would have told you.”
表示祝愿、假设、想象等含义
表示祝愿
使用动词原形。例如：“May you have a wonderful day!”
表示假设
在条件状语从句中的用法
使用“if”引导从句，根据时态需要使用相应的动词形式。例 如：“If you study hard, you will pass the exam.”
在主句中的用法
根据时态需要使用相应的动词形式。例如：“If you studied hard, you would pass the exam.”
使用“if”引导从句，动词用过 去时态。例如：“If there were no gravity, we would float in
the air.”
表示想象
使用动词的过去时态或 “would+动词原形”。例如： “I imagined that I was flying
a kite.”
在条件状语从句和主句中的用法
主句谓语动词形式
主语+should/would/might/could+动词原形。
虚拟过去将来时
从句谓语动词形式
If+主语+had+过去分词。
主句谓语动词形式
主语+should/would/might/could+have+过去分词。
03 虚拟语气的用法
表示与事实相反的情况
与现在事实相反
与将来事实相反
主句谓语动词形式
主语+should/would/might/could+动词原形。
虚拟语气详细讲解ppt课件.ppt
篮球比赛是根据运动队在规定的比赛 时间里 得分多 少来决 定胜负 的，因 此，篮 球比赛 的计时 计分系 统是一 种得分 类型的 系统
1.1 虚拟语气的类别
• 从虚拟语气的形式和内容两方面着眼，可 将其分为三大类：
• be型虚拟语气 • Were型虚拟语气 • 条件虚拟语气
篮球比赛是根据运动队在规定的比赛 时间里 得分多 少来决 定胜负 的，因 此，篮 球比赛 的计时 计分系 统是一 种得分 类型的 系统
place? • 你怎么敢象是这地方的主人似的随意进来？ • I would rather we had dinner now. • 我倒愿意现在就吃饭。
篮球比赛是根据运动队在规定的比赛 时间里 得分多 少来决 定胜负 的，因 此，篮 球比赛 的计时 计分系 统是一 种得分 类型的 系统
篮球比赛是根据运动队在规定的比赛 时间里 得分多 少来决 定胜负 的，因 此，篮 球比赛 的计时 计分系 统是一 种得分 类型的 系统
• Please sit down! • I am a teacher./I am not a teacher./Are you
a teacher? • If I were you, I would do better.
• 简单的简单句
• 六个最基本句型,以及其中包含的六种句子成分(主 谓宾系表补)。
• ①SV(主谓) • ②SVO(主谓宾) • ③SVP(主系表) • ④SVOOC(主谓宾宾补) • ⑤SVIODO(主谓双宾语) • ⑥There be + O (There be)
篮球比赛是根据运动队在规定的比赛 时间里 得分多 少来决 定胜负 的，因 此，篮 球比赛 的计时 计分系 统是一 种得分 类型的 系统
高中英语语法课件-虚拟语气(全)(共55张PPT)详解
实战练习 5
2001年1月大学英语四级题目： Some women a good salary in a job instead of staying home, but they decided not to work for the sake of the family. A. must make B. should have made C. would make D. could have made
解题思路
这是一道错综时间虚拟条件句。 在本句中，从句是对过去发生的事情进 行假设，主句是对现在情况的假设。 译文：当你掉下来时，如果不是我在梯 子下面把你接住，恐怕你现在就不会笑 了。选A
实战练习 2
If you had taken your medicine yesterday, you ___ well now. A. are B. had been C. would be D. were 正确答案: C
祈使语气主要用于祈使句。 e.g. Get out of here! 虚拟语气
II. 什么是虚拟语气？
虚拟语气是一种特殊的动词形式，表示说话人 所说的话不是事实，而是想象、假设、建议、 打算、意见、愿望、怀疑、推测、喜悦等等。 e.g. If we had met her last night, we would have told her what had happened. 如果我们昨晚见到她，我们就会告诉她发生了 什么事。 （实际上，我们并没有见到她，也没有告诉她 所发生的事。）
注意！！！
如果条件从句是否定式，倒装时只能把 not 放在主语之后，不能用缩写式把not 放在主语之前。 e.g. Had you not told me about the matter, I should never have known the whole thing. (不能说：Hadn’t you told me…)
虚拟语气-(共51张)PPT课件
A. Were B. should C. would D. will
-
18
If you had followed my advice, you would be
able to finish the work now. 如果你当时听了我的话，现在就能完成这份 工作了。 （从句说明过去，主句说明现在。）
时 间 If 条件句
主句
过去
现在
将来
-
10
一、一般条件句中的虚拟语气
时 间 If 条件句
主句
过去
had done
would should could might
+have done sth
现在
would
助动词 be用 were should 实义动词 do 用 did could
might
+ do sth
Without your help, we D____ such rapid progress.
A. couldn’t make B. wouldn’t make
C. will not have made D. wouldn’t have made
-
24
名词性从句中的虚拟句
-
25
宾语从句中的虚拟语气
句式一：wish后面宾语从句中的虚拟语气，表示
与事实相反的愿望。其表达形式一般是将从句的谓
语动词退后一个时态。例如:
1)与现在事实相反 : wish + (that)+did(were)
I wish I were as healthy as you.
A.could take B.would take
C.will have taken D.would- have taken
虚拟语气-完整版PPT课件
= It is our suggestion that you (should) be there on time.
= It is suggested that you (should) be there on time.
2.If I had had time, I would have stayed there. Had I had time,
3.If it should rain/If it were to rain tomorrow, I would stay at home. Should it rain tomorrow, Were it to rain tomorrow
3）. 错综时间条件句： If you had followed the doctor’s advice, you would feel better now.
条件从句谓语与主句谓语发生时间不一致时，被称为 错综时间条件句。此时主句和从句的谓语动词要依照 假设的时间而定。
If he _h_a_d__s_p_e_n_t(spend) more time practicing speaking English before, he _w_o_u_l_d_b_e____(be) able to speak it better now.
你该离开了。
should do
It’s high time( that )you left.
It’s high time( that) you should leave.
我们该下课了。 It’s time that we had a break. It’s time that we should have a break.
虚拟语气ppt课件完整版
02 03
例子
Had you come earlier, you would have met him.（= If you had come earlier, you would have met him.）（如果你早点来，你就能 见到他了。）
例子
Should it rain tomorrow, we would stay at home.（= If it should rain tomorrow, we would stay at home.）（如果明天下雨，我们就 呆在家里。）
虚拟语气用于强调句时，通常是通过 “It was ... that”结构对句子中的特 定成分进行强调。
在这种结构中，虚拟语气的使用与普 通虚拟语气略有不同，需要根据具体 情况进行判断。
虚拟语气与其他语法结构搭配使用
虚拟语气可以与定语从句、状语从句等语法结构搭配使用，表达更为复杂的语义关 系。
在这些结构中，虚拟语气的使用需要根据具体的语境和表达的语义关系进行判断。
真实条件句
表达现实中可能实现的情况， 使用陈述语气。
例子
If you study hard, you will pass the exam.（如果你努力 学习，你会通过考试。）
非真实条件句
表达与事实相反或不太可能实 现的情况，使用虚拟语气。
例子
If I were you, I would not do that.（如果我是你，我不会那
状语从句中虚拟语气使用
在if条件状语从句中
如果条件状语从句所表示的内容与实际情况相反或实现的可能性很小，则从句中的谓语动词常用虚拟语气。
在其他状语从句中
除了if条件状语从句外，还有一些其他状语从句也可以用虚拟语气，如：in order that（为了）、so that（以便 ）等引导的目的状语从句中。这些从句中的谓语动词形式通常为“may/might/could/should + 动词原形”。
高中英语虚拟语气课件课件(共71张ppt)
• A. will allow
B. should allow
• C. would have allowed D. had allowed
3.If we had known that she had planned to go abroad today, we ____ at the airport.
过去式(did) be were
①did / were ②should +do ③were to do
would should could might
+have done sth
would should could might
+ do sth
would should + do sth could might
如果他当时用功学习的话，他可能就得到奖学 了。
if he H__a_d_s_t_u_d_i_e_d(study) hard, he _c_o_u_ld__h_a_v_e__w_i_n_(win) the scholarship. 如果昨天他见到你，他就可能问你这个问题。
If he h_a_d__s_ee_n_(see) you yesterday, he _W__o_u_ld__h_a_v_e__a_sk_e_d__(ask) you about it.
不是一个事实，而是一种假设、猜 测、怀疑、愿望、要求、命令、建 议等 。
• I have a car. • 我有一部车。（指现在有）
• I had a car. • 我有一部车。（指过去有）
• I wish I had a car. • 但愿我有一部车。（实际没有，表
愿望）
一、if 条件句中的虚拟语气
- 1、下载文档前请自行甄别文档内容的完整性，平台不提供额外的编辑、内容补充、找答案等附加服务。
- 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
- 3、如文档侵犯您的权益，请联系客服反馈,我们会尽快为您处理(人工客服工作时间：9:00-18:30)。
一、选择题1．If I _______ you, I would give some flowers to her.A．am B．are C．was D．were2．—I’m going to Larry’s party. But I don’t know what to wear.—If I ___ you, I _______ wear a dress.A．am; will B．were; willC．were; would D．am; would3．— What would you do if you _______ a million dollars?— I would give it to charity.A．have B．had C．will have D．would have4．– I coughed a lot last night. What should I do?– If I _____ you, I would go to see the doctor at once.A．am B．wereC．was5．I wish I ____fly to the moon one dayA．can B．could C．am D．was6．----What can I do with so much money?----If I _______ you, I _______ give it away to charity.A．am, will B．am, would C．were, would D．was, would7．–I argued with my best friend. What should I do?--If I ________ you, I would say sorry to her.A．am B．was C．are D．were8．--------- Come and join us, Jim!---------- I’m sorry I can’t . If I _______ time, I would certainly go.A．will have B．have had C．had D．had had9．If his brother a millionaire（百万富翁）, he'd buy her sister the expensive car. A．was B．were C．is D．be10．If I ________ invited tonight, I would go to the dinner party.A．was B．were C．am D．is11．---Can you tell me what to wear at the party?---If I ___you,I___the blue jeans.A．was,will wear B．am,will wear C．were,would wear D．were,wore 12．—I like drinking wine. But people who drink wine aren’t allowed to drive.—If I you, I would give up wine.A．were; drinking B．am; drinkingC．were; drink D．was;to drink13．—I like drinking wine. But people who drink wine aren’t allowed to drive.—If I you, I would give up wine.A．was; to drink B．am; drinking C．were; drink D．were; drinking14．—I should have been more careful in the exam.—It is a great pity that you __________.A．didn’t B．haven’t C．were not D．are not15．（题文）I would wear a shirt and tie to the party if I ________ you. It’s more polite. A．were B．will be C．am16．If I a bird, I _ fly in the blue sky.A．was; would B．am; willC．will be; will D．were; would17．If my mother ___ I get a grade of 50 in English exam, she would be angry.A．knows B．knewC．has known D．would know18．If I were invited to the party，I _______ a red skirt.A． will wear B． wear C． would wear19．You should_______ watched TV. There is so much work to do,A．not have B．have not C．not D．not having20．I don’t understand how you got a ticket. I always you a careful driver.A．think; are B．am thinking; areC．thought; were D．think; were21．You are overweight. You’d better any junk food. I suggest you more vegetables. A．not to eat, to have B．not eat, have C．not eat, to have D．not to eat, have 22．I suggest you __________ four or five words a day on pieces of paper.A．write B．to write C．writing D．written23．_______ in order to sit for the college entrance exam?A．What did she suggest he read B．What did she suggest he readsC．Did she suggest for him to read D．Did she suggest what he read24．I think all the plants would________ if there was too much pollution.A．died out B．die of C．die out D．died of25．If I______you, I_______go there at once.A．am, would B．were, would C．were, will D．am, will【参考答案】***试卷处理标记，请不要删除一、选择题1．D解析：D【解析】试题分析：句意：如果我是你，我会送她一些花。
这是由if引导的一个虚拟语气句子，表示与现在事实相反的情况，其句型为“ if+ 主语 + 动词的过去式（ be 动词用were ），主语 +would / could / might / should + 动词原形”。
故选D。
考点：考查虚拟语气的用法。
2．C解析：C【解析】试题分析：根据题干，本句的意思应是“如果我是你，我将穿一件裙子。
”“我”是不可能成为“你”，所以本句是一个虚拟语气。
对于虚拟语气，从句应该用过去式（be动词，不论是第几人称，都用were），主句用would do。
所以本题选C。
考点：本题考查虚拟语气。
点评：完成本题时注意区分虚拟语气和if引导的条件状语从句。
虚拟语气是不可能发生的，是一种假设情况；而if引导的条件状语从句，是有可能发生的。
如果不明白这两者的区别，就比较容易发错。
3．B解析：B【解析】试题分析：句意:-如果你有一百万美元你会做什么？-我会把它捐给慈善事业。
have 有；had 过去式；will have 一般将来时；would have 过去将来时。
根据句意可知，这里表示的是一个假设的问题，在if引导的条件状语从句中应该用虚拟语气，动词用过去式，故选B。
考点：考查虚拟语气。
4．B解析：B【解析】试题分析: 句意：昨晚我不停地咳嗽，我应该怎么办？哪果我是你，我就会马上去看医生。
此句为虚拟语气，与现在事实相反，虚拟语气的条件从句的谓语用过去式(be通常用were)，主句谓语用“should (would, could, might)+动词原形”，故选C。
考点：考查虚拟语气。
5．B解析：B【解析】试题分析：句意：我希望有一天我能飞到月球。
通过对这句话的理解我们可以知道这是一个几乎不可能实现的愿望，故在wish 后面的宾语从句中应用虚拟语气，所以用过去时态。
故选B。
考点：考查虚拟语气。
6．C解析：C【解析】试题分析：考查虚拟语气。
句意你如何处理这些钱？如果我是你，我会把它捐给慈善机构。
表示对现在的虚拟，if引导的从句用一般过去时，语句用would do ,故选C项。
考点：考查虚拟语气。
D【解析】试题分析：句意：如果天气是好的，我们的运动会就不会推迟了。
这里是虚拟语气，根据wouldn’t可知这是对现在的虚拟，在条件状语中对现在的虚拟用were；put down 镇压，记下；put up提供； put off推迟。
根据句意故选D。
考点：考查虚拟语气的用法。
7．D解析：D【解析】试题分析：句意：我和我最好的朋友吵架了。
我该怎么办？如果我是你，我就对她说对不起。
虚拟语气用来表示说话人的主观愿望或假想，所说的是一个条件，不一定是事实，或与事实相反。
在虚拟条件语气句中，表示与现在事实相反的事实，条件从句中的谓语动词用过去式（be用were不用was），主句谓语动词为“would+原形动词”，所以选D。
考点：考查虚拟语气。
8．C解析：C【解析】试题分析：虚拟语气是一种特殊的动词形式，用来表示说话人所说的话并不是事实，而是一种假设、愿望、怀疑或推测。
判断是真实条件句还是非真实条件句。
只有在非真实条件句中才使用虚拟语气。
通过句子意思，看假设的条件是否能够实现，能够实现是真实条件句，不能使用虚拟语气；假设的条件不能实现则是非真实条件句，要用虚拟语气.判断这个假设是与哪个事实相反。