用於其他情況的虛擬語氣
1、一想要(desire) 一寧願(prefer) 一堅持(insist)二命令(order , command) 三建議(advise , suggest , propose/recommend) 四要求(demand , require , request , ask)中，無論主句謂語動詞為何種時態，從句的謂語動詞都用："should + do"。should可以省略。
eg：He suggested that we (should) take the teacher's advice.
He insisted that we (should) take the teacher's advice.
He demand that we (should) take the teacher's advice.
He ordered that we (should) take the teacher's advice.
insist意為“堅持某種動作”才用虛擬語氣;意為“堅持某種觀點，某個事實”則不用虛擬語氣。
eg：
He insists he is a student.
他堅持說他是個學生。
這個語句表示的是事實，因此在這個語句中不能使用虛擬語氣。
suggest意為“建議”才用虛擬語氣，意為“暗示”則不用虛擬語氣。
eg：
His face suggests that he looks worried .
他的表情暗含著他很擔心。
這個句子本身是事實，因此它就沒有用到虛擬語氣。
2、表情緒.觀點的形容詞或名詞也要用虛擬語氣.如：necessary、important、impossible、natural、strange、surprising、funny、right、wrong、better、a pity ,the shame ,no wonder等。
句型：It is.......that +主語從句，從句的謂語動詞常用should+原形且should的省略要看情況而定。
eg:
Do you think it is necessary that he (should)not be sent to Lingbao.(should表示“建議”的語氣，可省。)
It is strange that such a person should be our friend.(should表示“竟然”的語氣，不可省。)
奇怪的是這樣一個人會成為我們的朋友。
We also use the subjunctive from in that clauses following adjective of urgency.These statements are similar to commands,but they are impersonal and therefore softer.here are some adjectives of urgency:advisable ,best,critical,desirable,essential,imperative,important,necessary,urgent,vital.
eg:
It's vital that you make a decision right now . (Impersonal and softer)
Make a decision right now! (Strong)
I insist that you make a decision right now. ( strong)
注：這一點還沒有準確的說法，希望善心人能把這點補充完全。
3、 在even if,even though 所引導的讓步狀語從句中用may/might+動詞原形，may/might可以省略，表示與現 在相反的情況;從句用過去完成時，表示與過去相反的情況，類似的詞有though/even though/whatever/however/so long as; 主句、從句的結構與if所引導的條件從句結構相同。
eg：
Even if he were here himself,he should not know what to do.
即使他親自來也不知該怎麼辦。(事實：他沒來)
Nobody could save him even though Hua Tuo should come here.
即使華佗在世也救不了他。(事實：華佗不在世)
4、 在whatever，whichever，whenever，whoever,wherever，however,no matter wh-等引導的讓步狀語從句中，從句虛擬語氣結構為：
指現 在或將來：may +do。
eg：
We will finish it on time no matter what may happen.
不管發生什麼事，我們都要按時完成。
We will find him wherever he may be.
無論他在哪裡，我們都要找到他。
I will wait for him no matter how late he may come.
不管他來的多麼晚，我都會等他。
指過去：may +have done。
eg：
You mustn't be proud whatever great progress you may have made.
不管你取得了多麼大的進步，你也不能驕傲。
We must respect him no matter what mistakes he may have made.
不管他犯過什麼錯誤，我們必須尊敬他。
5、一般would rather,had rather,would sooner等之後的賓語從句常表示與客觀事實不相符的一種願望，故使用虛擬語氣。其虛擬語氣的結構為：
過去 had + done
現 在 過去時(be 用were )
將來 過去時(be 用were ) (would rather將來情況用一般過去時)
eg：
I'd rather you had seen the film yesterday.
我倒想你昨天看過了這場電影。
I'd rather you were here now.
我倒想你現在在這兒。
We'd rather you went here tomorrow.
我們倒想你明天去那兒
注：注意would rather，had rather，would sooner的細微差別，可以百度一下查查。
6、虛擬語氣還可用在定語從句中，表示：“早該做某事了”時，定語從句中的謂語動詞須用虛擬語氣，其虛擬語氣的結構為：It is (high / about) time that + 主語+ 動詞的過去式/ should + do(should不可省略)(優先使用動詞過去式)，即從句用虛擬過去式。
It is time that I went to pick up my daughter at school.
我該去學校接我的女兒了。
It is high time you should go to work.
你早該上班了。
7、 簡單句中的虛擬語氣
(1) 說話時，為了表示客氣、謙虛、委婉而有禮貌，言語常使用虛擬語氣。其虛擬語氣的結構形式常為：would / could / might / should +do。
eg：
Would you mind my shutting the door?
你介意我把門關起來嗎?
You should always learn this lesson by heart.
你要把這個教訓牢記於心。
I should agree with you.
我本該同意你的觀點。(委婉的不同意)
(2)表示“祝願”時，常用may +主語+ do。
eg：
May you have a good journey!
祝你一路順風。
May your youth last forever!
祝你青春永駐。
(3)表示強烈的“願望”、“祝願”時，常用do。
eg：God bless us. 上帝保佑。
(4)習慣表達中常用的虛擬語氣。
① 提出請求或邀請。eg：
Would you like to have a talk with us this evening?
今天晚上來跟我們聊天好嗎?
Could I use your bike now?
我可以用一下你的單車嗎?
② 陳述自己的觀點或看法。eg：
I should be glad to meet you.
見到你我會很高興。
I would try my best to help you.
我會盡力幫助你。
③提出勸告或建議。eg：
You'd better ask your father first.
你最好先問一問你的父親。
You should make a full investigation of it first.
你應該先全面調查一番。
④ 提出問題。eg：
Do you think he could get here on time
你認為他能按時來嗎?
Do you expect he would tell us the truth?
你期望他會告訴我們真相嗎?
⑤表示對過去情況的責備時，常用虛擬語氣。其虛擬語氣的結構為：情態動詞+ have done。
eg：
You should have got here earlier. 你早該到這裡了。
You should have returned it to him. 你早該把它還給他了。
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