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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)動詞，也是高考重要考點，學習時應注意下列幾點：?
一、了解相互間關系?
had?better(最好),?should(應該)與ought?to（應該）均為提建議、闡述觀點的情態(tài)動詞，其后接動詞原形。should?比had?better語氣強，ought?to語氣最強。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有風度的先生對一個女子是如此之粗魯。?
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，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.?此時你最好別出發(fā)。?
例2：He?shouldn't?be?careless?in?class.?他上課時不應粗心。?
例3：She?oughtn't?to?waste?time.?她不應該浪費時間。?
（二）一般疑問句?
had?better,?should,?ought?to用于一般疑問句時，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??你應該這么做嗎？?
例3：Ought?he?to?go?there??他應該去那里嗎？?
（三）反意疑問句?
陳述句謂語動詞含had?better,?should,?ought?to時，反意疑問句為：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??你應該認真學習，是嗎？?
例3：He?oughtn't?to?speak?in?class,?ought?he??你上課不應該講話，是嗎？?
三、?掌握其完成式用法?
had?better沒有完成式，should與ought?to完成式意義與用法完全相同。?
（一）should/ought?to?have?done?意為本來應做但實際沒有做，表達遺憾的感情色彩。?
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。?該空含你本來應來但實際未來之意，應填ought?to?have。?
（二）should?/?oughtn't?to?have?done，意為本來不應做但實際已做，表達遺憾的感情色彩。?
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。?該空含你本不應該一句話不說就離開家但實際已這么做之意，所以應填shouldn't?have?left。?
單位：湖北省荊門 姓名：李國 E_mail：liguo619@
高一英語（下）必修三Unit 2 had better, should, ought to用法辨析
