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1、
had?better,?should,?ought?to用法辨析
had?better,?should,?ought?to是重要的情態(tài)動(dòng)詞，也是高考重要考點(diǎn)，學(xué)習(xí)時(shí)應(yīng)注意下列幾點(diǎn)：?
一、了解相互間關(guān)系?
had?better(最好),?should(應(yīng)該)與ought?to（應(yīng)該）均為提建議、闡述觀點(diǎn)的情態(tài)動(dòng)詞，其后接動(dòng)詞原形。should?比had?better語(yǔ)氣強(qiáng)，ought?to語(yǔ)氣最強(qiáng)。一般情況下should與ought?to可通用。?
例1：You?had?better?go?there?at?once.?你最好立即去那里。?
例2：You?ought?to?/?s
2、hould?work?hard.你應(yīng)該努力工作。?
值得注意的是：should還有"竟然"之意，表出乎意料。?
例：You?can't?imagine?that?a?well-behaved?gentleman?should?be?so?rude?to?a?lady.?你真是難以想象這么一個(gè)有風(fēng)度的先生對(duì)一個(gè)女子是如此之粗魯。?
二、?掌握句型變換方法?
had?better,?should,?ought?to作為情態(tài)動(dòng)詞，各種句型變換均在自身形式上作變化。?
（一）否定句?
had?better,?should,?ought?to用于否定句時(shí)，否定詞均位于其后，具體形式為：had
3、?better?not?do,?shouldn't?/?should?not?do,?oughtn't?to?do。?
例1：You?had?better?not?start?at?this?time.?此時(shí)你最好別出發(fā)。?
例2：He?shouldn't?be?careless?in?class.?他上課時(shí)不應(yīng)粗心。?
例3：She?oughtn't?to?waste?time.?她不應(yīng)該浪費(fèi)時(shí)間。?
（二）一般疑問(wèn)句?
had?better,?should,?ought?to用于一般疑問(wèn)句時(shí)，分別將had,?should,?ought提至句首。?
例1：Had?he?bette
4、r?start?early?at?once??他最好立即出發(fā)嗎？?
例2：Should?you?do?like?this??你應(yīng)該這么做嗎？?
例3：Ought?he?to?go?there??他應(yīng)該去那里嗎？?
（三）反意疑問(wèn)句?
陳述句謂語(yǔ)動(dòng)詞含had?better,?should,?ought?to時(shí)，反意疑問(wèn)句為：had,?should與ought+主格人稱代詞或hadn't,?shouldn't,?oughtn't+主格人稱代詞。?
例1：You?had?better?not?go?home,?had?you??你最好別回家，是嗎？?
例2：You?should?stud
5、y?hard,?
shouldn't?you??你應(yīng)該認(rèn)真學(xué)習(xí)，是嗎？?
例3：He?oughtn't?to?speak?in?class,?ought?he??你上課不應(yīng)該講話，是嗎？?
三、?掌握其完成式用法?
had?better沒(méi)有完成式，should與ought?to完成式意義與用法完全相同。?
（一）should/ought?to?have?done?意為本來(lái)應(yīng)做但實(shí)際沒(méi)有做，表達(dá)遺憾的感情色彩。?
例：There?was?a?lot?of?fun?at?yesterday's?party.?You?________?come,?but?why?didn't?you??
6、
A.?must?have?B.?should?C.?need?have?D.?ought?to?have?
析：答案D。?該空含你本來(lái)應(yīng)來(lái)但實(shí)際未來(lái)之意，應(yīng)填ought?to?have。?
（二）should?/?oughtn't?to?have?done，意為本來(lái)不應(yīng)做但實(shí)際已做，表達(dá)遺憾的感情色彩。?
例：I?was?really?anxious?about?you.?You?________?home?without?a?word.?
A.?mustn't?leave?
B.?shouldn't?have?left?
C.?couldn't?have?left?
D.?needn't?leave?
析：答案B。?該空含你本不應(yīng)該一句話不說(shuō)就離開(kāi)家但實(shí)際已這么做之意，所以應(yīng)填shouldn't?have?left。?
單位：湖北省荊門 姓名：李國(guó) E_mail：liguo619@
高一英語(yǔ)（下）必修三Unit 2 had better, should, ought to用法辨析
