2019年高考英語二輪專題復習6情態動詞和虛擬語氣
i cannot help admiring the picture whenever i look at it.每當我看到這幅畫時，我都禁不住要鑒賞它。
when a close friend dies,you cannot but feel sad.
親密的朋友去世時，你會不由得感到悲傷。
6.表示祝愿、祝福的may,此時句子用倒裝語序
may he live to an old age!愿他長命百歲！
may god be with you!愿上帝保佑你！
7.shall/should
用于人稱 意義
shall 第一、三人稱 征求對方的意見
第二、三人稱 說話人給對方的警告、命令、允諾、威脅
用于法律、法規等條文中 應……，須……，得……
what shall we do this evening?
注意：may用于征求對方的許可，而shall用于征求對方的意見或指示：
may i have a look?我能看一看嗎？
shall i have a look?需要我看一看嗎？
you shall fail if you don’t work harder. （警告）
he shall have the book when i finish reading. （允諾）
he shall be punished.（威脅）
the fine shall be given in cash.罰款須以現金繳納。
should 意義
①（表義務、責任的）應該
②（表預期的）應該會，想必會，一定……會把
③（表驚訝、遺憾的）竟然、居然
④（與疑問詞連用，表意外、驚訝、納悶等的）究竟是，到底
⑤（用于表示命令、建議、請求等詞后面的that從句中，且should可以省略）應該，必須
①you should apologize to him.
②the photos should be ready by 12:00.
③i’m surprised that you should speak in such a way.
④who should ccome in but my old friend betty.我當究竟是誰進來了呢，原來是我的老朋友貝蒂呀。
⑤i suggested that he (should)change his mind.
my suggestion was that he (should)change his mind.
注意：ought to表示 “應該” (與should同義, 只是語氣稍重一些), 也可表示推測。
you ought to take care of him.
he ought to be home by now.
8.will/would
①請求、建議，would比will委婉客氣
would you pass me the book?
②表示意志、愿望和決心
i will never do that again.
they asked us if we would do that again
③可表示過去反復發生的動作或某種傾向
during the vacation he would visit me every week
the wound would not heal.
④表示估計或猜想
it would be about ten when he left home.
what would she be doing there?
9.dare和need
①need作為情態動詞只有一種形式，只用于否定句和疑問句。
②dare作為情態動詞用時有兩中形式：dare和dared兩個詞形。
除了可以用于否定句和疑問句外，還可以用于條件從句或表示懷疑的句子中。
if he dare come,i will kick him out.
i don’t know whether he dare say.
note:he doesn’t dare(to)answer the question.
does she dare(to)enter the dark room?