三、句子
1.he doesn’t know if he should bring a present. 他不知道是否该带礼物。
2.you shouldn’t worry about what other people say.
你不应该考虑别人说什么。
3.what will you do if you had a million dollars?
如果你有一百万美元，你会干什么？
4.if i were you, i ‘d take a small present.
如果我是你，我会带一个小礼物。
5.i’m too tired to do well.我太累了，没考好。
6.dogs can be a lot of trouble.狗会带来很多麻烦。
7.what are you like? 你是什么样的人？
8.i’d invite him/her to have dinner at my house.
我会邀请他（她）到我家吃饭。
9.you enjoy the company of other people.你喜欢别人的陪伴。
10. i feel nervous talking in front of many people.
我在众人面前讲话时感到紧张。
11.she always comes top in the school exams.
她在学校的考试中总是名列前茅。
12.she doesn’t want to let her friends down.她不愿让朋友失望。
13.if i were you, i’ll get out of here.如果我是你，我会离开这里。
虚拟语气
一、词的语气
指我们平常说的说话人说话的口气。（在英语中，语气除了指语调以外，最主要的是通过动词发生变化而表示不同语气）
英语中的语气分为三类：
陈述语气（用于陈述句、疑问句、感叹句）
祈使语气（用于祈使句）
虚拟语气（用于条件状语从句、宾语从句等）
二、虚拟语气
如果所说的不是事实，而是一种假设、愿望、建议或是一种实现不了的空想，就用虚拟语气。
三、虚拟语气在非真实条件状语从句中的用法
1、真实条件状语从句与非真实条件状语从句
eg if he doesn’t hurry up, he will miss the bus.( 真实条件状语)
if he was free, he asked me to tell stories.（真实条件状语）
if i were you, i would go at once.（非真实条件状语从句）
if there was no air, people would die.（非真实条件状语从句）
2、虚拟语气在非真实条件状语从句中的用法及动词形式
① 表示与现在事实相反的情况
if i were you, i’d take an umbrella.如果我是你，我会带把伞。
if i knew his telephone number, i would tell you.
如果我知道他的电话号码，我就会告诉你。（事实：不知道）
if there were no air or water, there would be no living things on the earth.
如果没有水和空气，地球上就不会有生物。(事实：地球上既有空气也有水)
if i had any money with me, i could lend you some.
如果我带钱了，我就会借给你些。（事实：没带钱）
if he studied harder, he might pass the exam.如果他在努力些，就能通过考试了。（事实：学习不用功）
②表示与过去事实相反的情况
主句谓语动词形式
had+过去分词
should/would/could/might+have+过去分词
从句
例句
主句
①were
if+主语 ② did
③were to do
(①通常与一个表示时间状语连用)其 中were to do可能性最小，
should+动词原形。
if it rained tomorrow our picnic
would be put off.
假如那天下雨，我们的郊游就推迟。
主句+should/would /might /could+动词原形
（条件）从句谓语动词形式
主句谓语动词形式
谓语动词用过去式（be用were）
should/would/could/might+动词原形
eg if i had got there earlier, i should/could have met her.
如果我早到那儿，我就会见到她。（事实：去晚了）
if he had taken my advice, he would not have made such a mistake.
如果他听我的劝告的话，就不会犯这样的错误了。（事实：没有听我的话）
③表示对将来情况的主观推测（可能相反或可能性很小）
eg: if he would come here tomorrow, i should/would talk to him.
如果他哪天来这儿的话，我就跟他谈谈。（事实：来的可能性很小）
if there were a heavy snow next sunday, we would not go skating.
如果下周日下大雪，我们就不能去滑冰了，（事实：不知能否下雪）
if she were to be there next monday, i would tell her about the matter.
如果她下周一来这儿的话，我就会告诉她这件事得始末。
四、虚拟语气的其他用法
1、虚拟语气用在wish 后的宾语从句
a、表示与现在事实相反的愿望，谓语动词用过去式
eg: i wish i had your brains.我希望我有你那样的头脑。(事实：我根本比不上你)
b、表示过去事实相反的愿望，谓语动词：had+v-ed
eg: i wish i had known the truth of the matter.我希望我原来知道这件事的真相。（事实：原来不知道）
c、表示将来难以实现的愿望
谓语动词：should/would + 动词原形
eg: i wish i should have a chance again.很难再有这样的机会了。（事实：很难再有这样的机会了）
②虚拟语气用在suggest(建议)、insist(坚持)、demand(要求)、order(命令)等动词后的宾语从句中。
在这种用法中，无论主句谓语动词为何种时态，从句的谓语动词都用：“should + 动
词原形”或只用“动词原形”。
如 he suggested
he insisted
he demand that we (should) take the teacher’s advice
he ordered