1、含情態(tài)動(dòng)詞must的反義疑問(wèn)句陳述部分有must，且表示必須時(shí)，附加疑問(wèn)句部分用mustnt，如果表示必要?jiǎng)t用neednt。陳述部分中是mustnt表示禁止時(shí)，附加疑問(wèn)句部分用must。陳述部分中的must表示一定、想必等推測(cè)意義時(shí)，附加疑問(wèn)句部分而是根據(jù)陳述部分的謂語(yǔ)動(dòng)詞或其助動(dòng)詞來(lái)定。They must clean the floor, mustnt they/neednt they?他們必須擦地板，是不是？We must stay at home, mustnt we?我們必須留在家里，是不是？We mustnt be late, must/may we?我們不許遲到，是不是？They

2、must work hard, mustnt they?(必須)They must take medical lessons, neednt they?(必要)He must be lying to me, _?A.mustnt be B.must be C.isnt be D.is be 他肯定在對(duì)我說(shuō)謊。must be doing 是對(duì)正在進(jìn)行的事情的推斷。還有must have done 是對(duì)過(guò)去情況的肯定推斷。must 這種用法的反意疑問(wèn)句不用 must 提問(wèn)。推斷用法：He must be lying to me.陳述用法：He is lying to me.陳述用法反意疑問(wèn)句：He

3、 is lying to me, isnt he?推斷用法反意疑問(wèn)句：He must be lying to me, isnt he?推斷用法：He must have been abroad.陳述用法：He has been abroad.陳述用法反意疑問(wèn)句：He has been abroad, hasnt he?推斷用法反意疑問(wèn)句：He must have been abroad, hasnt he?推斷用法：He must have gone swimming yesterday.陳述用法：He went swimming yesterday.陳述用法反意疑問(wèn)句：He went swi

4、mming yesterday, didnt he?推斷用法反意疑問(wèn)句：He must have gone swimming yesterday, didnt he?He must be a visitor, isnt he?(對(duì)現(xiàn)在情況的推測(cè))You must have seen him at his birthday party yesterday, didnt you?(對(duì)過(guò)去情況的推測(cè),且句中有過(guò)去的時(shí)間狀語(yǔ))You must have seen him at his birthday party,havent you?(強(qiáng)調(diào)動(dòng)作的完成)1 帶 have to 時(shí)，附加疑問(wèn)用 do 或

5、 have的相應(yīng)形式 , 用 do 更常見。 You dont have to go to school on Sundays , do you ? We have to work today , dont we ? (havent we ?)2 帶 must時(shí)A 表示“必須”，附加疑問(wèn)部分用 mustnt We must work hard , mustnt we ?B 表示“有必要”時(shí)，附加疑問(wèn)部分用 neednt. The teacher must show concern for each pupil , neednt he ?C 表示“推測(cè)”時(shí)，附加疑問(wèn)部分要與陳述部分的謂語(yǔ)動(dòng)詞相呼

6、應(yīng)。 He must be a teacher, isnt he ? D must + have + done 是對(duì)過(guò)去情況的推測(cè)，當(dāng)陳述部分沒(méi)有明確的表示過(guò)去的時(shí)間狀語(yǔ)時(shí)，附加疑問(wèn)要用have的相應(yīng)形式；當(dāng)陳述部分有明確的過(guò)去時(shí)間狀語(yǔ)時(shí)，附加疑問(wèn)要用過(guò)去時(shí)。 You must have lived here for a long time , havent you ? You must have seen him yesterday , didnt you ?E 當(dāng)陳述部分是 must not , 表示“一定不要” 、“禁止”時(shí)，附加疑問(wèn)除用must 外，還可以用may. I must not tell him , must I ? ( may I ?)3 帶 used to 時(shí)，附加疑問(wèn)用 usednt 或didnt . 但口語(yǔ)中傾向于后者。 There used to be an apple tree in the garden , didnt there ? (usednt there ? )4 帶need 時(shí)，附加疑問(wèn)用 do 或 need ,應(yīng)該與陳述部分 need 用法相呼應(yīng)。 I neednt tell you the answer , need I ? You need to buy a better dictionary , do