动词的语气。
一。概念。语气有三种：陈述语气，祈使语气和虚拟语气。语气表示说话人对劝词所示示的动作或所处的状态持有的态度或看法。
二。相关知识点精讲。
1.辨别if 引导真实条件句和if引导的虚拟条件句的区别。
if he has time, he will go with us.= probably he has time and will go with us.
if he had time, he would go with us.=but in fact he has no time.
2.虚拟条件句中主句和从句的谓与动词构成形式如下表。
3.混合时间的虚拟语气。
如果条件句中的动作和主句的动作不是同时发生，主句和从句的谓语动词的形式应分别根据各自所表示的时间加以调整。
1)0if i had received the passport yesterday, i would start today.
2)if he had telephoned me last night, i would see him now.
3)if he had followed the doctor’s advice, he would be all right now.
4)if china had not been liberated, the working people would still be leading a miserable life.
could / might/ ought to + h**e done 表示“过去本应该/可以做而实际上却没做”
needn’t h**e done 表示“过去没必要作而实际上做了”
5.虚拟语气中的倒装句。
如果虚拟语气的条件从句谓语动词中含有were, had, could, should，有时可将if省去，而将条件从句的主语置于were, had, should, could 之后。
had you invited us, we would h**e come to your party.
were i you, i would do more practice after class.
could she lend us a helping hand, she would do so.
后面的宾语从句的谓语动词应使用虚拟语气， 表示“可惜…；…就好了； 悔不该…； 但愿…。”
1)i wish i knew the key to the answer.
2)i wish i were ten years younger.
3)i wish that i had gone to the football match last week.
4)i wish that you had been here yesterday.
5)he wishes that we would visit the old school.
7.表示命令或建议动词suggest, insist, propose, desire, demand, request, order, command 后的宾语从句中应使用虚拟 should +动词原形； should 不可用would 来替代； 主句所使用的动词时态不限。
为“建议去做…; 命令…”从句用should + do
为“ 说明； 暗示”, 从句用过去时或过去完成时。
1) the doctor suggested that i should take the medicine three times a day.
2) the doctor suggested that my grandmother had caught a bad cold.
“坚持要去做…，坚持应该去做”，从句用should + do为“坚持表明，坚持说/解释”， 从句用过去时或过去完成时。
10.虚拟语气也用于表语从句和主语从句中，表示间接的命令、要求、请求、建议、决定等，主句的主语通常是suggestion, proposal, request, order, idea 等。表语从句中的谓语动词是should +动词原型，should 可以省略。
11.在主语从句中，当从句用来表示惊奇、不相信、惋惜等，从句的谓语动词用需拟语气形式。其谓语动词时should + 动词原型， 或should 省略。
三。巩固练习。
1. if there were no subjunctive mood, englishmuch easier.
a. will beb. would h**e been
c. could h**e been d. would be
2. if i __you, i’d join the army.
a. am b. wasc. wered. would be
3. if he __tomorrow, he would find mr wang in the office.
a. comes b. will come c. should come d. come
4. if it __next week , the crops would be s**ed.
a. rains b. will rains c. would raind. should rain
5. if i __it, i would do it in a different way.
a. were to do b. do c. had doned. was to do
6. supposing the weatherbad, where would you go ?
a. isb. will bec. wered. be
7. if he had worked harder, he
a. would succeedb. had succeeded
c. should succeedd. would h**e succeeded
8. if hehethat food.
a. was warned; would not take
b. had been warned; would not h**e taken
c. would be warned; had not taken
d. would h**e been warned; had not taken
9. if my lawyerhere last saturday, he __me from going.
a. had been; would h**e prevented
b. had been; would prevent
c. were; would prevent
d. were; would h**e prevented
10. if he __it, he __it.
a. had seen; could h**e believed b. saw; couldn’t believe
c. saw; couldn’t h**e believed d. has seen; had believed
11. —do you think the thief entered through the window?
no, if he had, i don’t believebroken the living-room’s window.
a. he would h**eb. he must h**e
c. he hadd. should he h**e
12. —did you go swimming last sunday?
no. we would h**e gone __nicer.
a. if the weather was
b. would the weather h**e been
c. had the weather been
d. should the weather be
13. _it __for your help, i couldn’t h**e made any progress.
a. had; not beenb. should; not been
c. did; not beend. not; been
14today, he would get there by friday.
a. would h**e leftb. was he le**ing
c. were he to le**e d. if he le**es
15. it is ordered that a new bridge __over the wide river.
a. should be built b. would built
c. will be builtd. built
四。答案。
高中英语语法考点分类汇总 动词用法辨析
1 why not 动词原形 干嘛不 是简略句，完全形式是 why don t you 动词原形 如 why not go and h e a look?干嘛不去看看？why not try it once again?为什么不再试试？2 seem 好象 的用法 记住几个结构 sb.sth.seem...
高中英语语法考点分类汇总 介词
介词。一。概念 介词表示它后面的名词或相当于名词的其他结构与句中其他成分的关系。二。相关知识点精讲。1.表示地点位置的介词。1 at in,on,to at 1 表示在小地方 2 表示 在 附近，旁边 in 1 表示在大地方 2 表示 在 范围之内 on 表示毗邻，接壤。to 表示在 范围外，不强调...
高中英语语法考点分类汇总 连词
连词。一。概念。连词是用来连接词，短语，从句或句子的词。连词不作成分。二。相关知识点精讲。1.表示并列关系的连词有 and,both and not only but also 和neither nor 等。1 and 和，并且。a 基本用法 and 表示 和 并且 的意思，用来连接对等关系的字和字...