談?wù)勌摂M語氣
如果你看到下列的句子，你會(huì)認(rèn)為它們是正確的還是錯(cuò)的呢？
1.I wish I were a bird.
2.We request that you be here tomorrow.
也許你會(huì)說:"哈哈，第一句的 I were 錯(cuò)了，應(yīng)該是 I was；而第二句中的 you be是什么東東呀？不是 you are, 也不是 you will be, 什么 you be?!"其實(shí)上面的句子都是一種稱為 Subjunctive 類型的句子。Subjunctive Mood 有的書譯為"假設(shè)語氣"，雖不很貼切；但在相當(dāng)大的程度上，告訴我們這種句子的特點(diǎn)。Subjunctive Mood中文譯作"虛擬語氣"，似乎不及"假設(shè)語氣"那么容易明白。它是一種動(dòng)詞形式，表示說話人的某種假設(shè)、愿望、懷疑、猜測(cè)、建議等含義。基本上，虛擬語氣可分為虛擬現(xiàn)在(Subjunctive Present)和虛擬過去(Subjunctive Past)兩種；但它們和時(shí)態(tài)(Tenses)上所指的現(xiàn)在時(shí)態(tài)(Present Tense)和過去時(shí)態(tài)(Past Tense)是有所不同的。
一、虛擬現(xiàn)在(Subjunctive Present):
虛擬現(xiàn)在的句子，在任何時(shí)候都要用動(dòng)詞的原形(root form)，就算是第三人稱(he,she, it)也是如此。如：
1.1 現(xiàn)在時(shí)態(tài)(Simple Present): (右邊為虛擬語氣)
　I work ---- I work
　you work ---- you work
　he works ---- he work (注意到了嗎，是 work，不是 works)
　she works ---- she work (不是 she works 喔）
　it works ---- it work　(同樣不是 it works 喔)
　we work ---- we work
　they work ---- they work 
1.2　現(xiàn)在進(jìn)行時(shí)態(tài)(Present Continuous):(右邊為虛擬語氣）
I am working ---- I be working (注意用的是 be，怪怪的!)
　you are working ---- you be working
　he is working ---- he be working
　she is working ---- she be working
　it is working ---- it be working
　we are working ---- we be working
　they are woring ---- they be working
1.3　現(xiàn)在完成時(shí)態(tài)(Present Perfect):(右邊為虛擬語氣)
I have worked ---- I have worked
　you have worked ---- you have worked
　he has worked ----- he have worked (用的還是have喔)
　she has worked ---- she have worked
　it has worked ---- it have worked
　we have worked ---- we have worked
　they have worked ---- they have worked
1.4　現(xiàn)在完成進(jìn)行時(shí)態(tài)(Present Perfect Continuous):(右邊為虛擬語氣)
　I have been working ---- I have been working
　you have been working ---- you have been working 
　he has been working ---- he have been working　(是 he have, 不是 he has )
　she has been working ---- she have been working
　it has been working --- it have been working
　we have been working ---- we have been working
　they have been working ---- they have been working
談?wù)勌摂M語氣(Subjunctive Mood)（二）
二、虛擬過去(Subjunctive Past)
虛擬過去的動(dòng)詞無論在什么情況之下都要用過去復(fù)數(shù)形式。如：動(dòng)詞 be，在虛擬過去中要用 were。
2.1　過去時(shí)態(tài)(Simple Past):(右邊為虛擬語氣)
　I worked ---- I worked
　you worked ---- you worked
　he worked ---- he worked
　she worked ---- she worked
　it worked ---- it worked
　we worked ---- we worked
　they worked ---- they worked
2.2　過去進(jìn)行時(shí)態(tài)(Past Continuous):(右邊為虛擬語氣)
　I was working ---- I were working （注意是 I were）
　you were working ---- you were working 
　he was working ---- he were working (是 he were 喔)
　she was working ---- she were working
　it was working ---- it were working
　we were working ---- we were working
　they were working ---- they were working
2.3　過去完成時(shí)態(tài)(Past Perfect):(右邊為虛擬語氣)
　I had worked ---- I had worked
　you had worked ---- you had worked
　he had worked ---- he had worked
　she had worked ---- she had worked
　it had worked ---- it had worked
　we had worked ---- we had worked
　they had worked ---- they had worked
　(耶，全部都用 had ! )
2.4　過去完成進(jìn)行時(shí)態(tài)(Past Perfect Continuous):(右邊為虛擬語氣)
　I had been working ---- I had been working
　you had been working ---- you had been working
　he had been working ---- he had been working
　she had been working ---- she had been working 
　it had been working ---- it had been working
　we had been working ---- we had been working
　they had been working ---- they had been working
談?wù)勌摂M語氣(Subjunctive Mood)（三）
三、簡(jiǎn)單的祝愿和命令：
3.1　祝愿
　1.May you be happy. (注意那個(gè)be)祝你幸福。
　2.May you have a good time.
　3.May the friendship between us last long,
　4.Have a good journey! 祝你旅途愉快！
3.2　命令
　注意：
1.命令虛擬語氣只能用在第二人稱(you)，而且通常省略主語(也就是you)。
　2.句子尾通常加上感嘆號(hào)：！
　3.虛擬語氣動(dòng)詞用一般現(xiàn)在時(shí)態(tài)(Simple Present)，如：work, be , go
　4.否定形式的命令語氣，可用助動(dòng)詞 do，加上 not。
　1.Work !
　2.Work harder !
　3.Be more alert ! (虛擬語氣動(dòng)詞 Be) 
　4.You go out !
　5.Do not work so hard. (do not 表示否定的虛擬語氣)
　6.Don't be afraid. (口語中常用don't 代替 do not)
談?wù)勌摂M語氣(Subjunctive Mood)(四)
四、在現(xiàn)在時(shí)態(tài)句里，用情態(tài)動(dòng)詞(Modal Verb)的過去時(shí)態(tài)(could,might,should,would)表示說話人的謙虛、客氣、有禮、委婉等：
1. Would you be kind enough to show me the way to the post office.(情態(tài)動(dòng)詞 would,表示客氣有禮)
2. It would be better for you not to stay up too late.(表示委婉)
五、虛擬語氣在賓語從句(Subordinate Clasue)中的用法：
5.1 在wish后的虛擬語氣賓語從句(可省略它的that)：
　　表示：
a.和現(xiàn)在的事實(shí)相反；
　　b.和過去的事實(shí)相反；
　　c.對(duì)將來的主觀愿望。
5.1.1 現(xiàn)在情況的虛擬，從句用過去式或過去進(jìn)行式(時(shí)間上是同時(shí)的)：
　1. I wish (that可省略,下同)I knew the answer to the question.(wish, 動(dòng)詞過去式 knew)
　　 我希望知道這個(gè)答案。(事實(shí)上是不知道)
　2. I wish it were spring in my hometown all the year around.(wish, were)
　　 但愿我的家鄉(xiāng)四季如春。(事實(shí)上不可能)
　3. I wish I were a bird.(wish, were)
　　 但愿我是只小鳥。(事實(shí)上不可能,難道是鳥人？呵呵) 
　4. When she was at the party,she wished she were at home.
　　 (wished,過去虛擬動(dòng)詞were)(事實(shí)上并不在家)
　5. Now that he is in China, he wishes he understood Chinese.(wishes,過去虛擬動(dòng)詞understood)
　　 現(xiàn)在他在中國(guó)，他希望能懂得中文。(事實(shí)上并不懂)
　6. When we begin the trip, they will wish they were with us.
　　 (will wish,過去虛擬動(dòng)詞were)(事實(shí)上并不和我們?cè)谝黄?
5.1.2 過去情況的虛擬，從句動(dòng)詞用"had + 過去分詞"（時(shí)間上較前):
　1. I wish (that可省略，下同)I hadn't wasted so much time.
　　 我后悔不該浪費(fèi)這么多時(shí)間。(事實(shí)上已浪費(fèi)了)
　2. He wishes he hadn't lost the chance.
　　 他真希望沒有失去機(jī)會(huì)。(其實(shí)已失去)
　3. We wished he had spoken to us.
　　 (wished，had + spoken)(事實(shí)上他并沒同我們講)
　4. I wish you had called earlier.
　　 (wish, had + called)(事實(shí)上已遲了)
　5. They will wish they had listened to us sooner.
　　 (will wish,had + listened)(事實(shí)上并不如此) 
5.1.3 將來情況的虛擬(表示將來的主觀愿望)，從句動(dòng)詞用"would/should/could/might + 動(dòng)詞原形"(時(shí)間上較后):
　1. I wish it would stop raining.(虛擬動(dòng)詞would+動(dòng)詞原形stop)
　　 我希望雨能停止。(事實(shí)上雨還在下著呢)
　2. I wish you would be quiet.(would + be)
　　 我希望你安靜一些。(事實(shí)上那家伙還在吵著呢)
　3. You wished she would arrive the next day.(would + arrive)
　　 你希望她第二天會(huì)到。(事實(shí)上她還沒到)
　4. I wish she would change her mind.(would + change)
　　 我希望她會(huì)改變主意。(呵呵，女孩子可沒那么容易就改變主意喔)
　5. He will wish we would join him the following week.(would + join)
　　 (只是希望我們和他在一起，實(shí)際上還沒在一起)