1 帶 have to 時(shí),附加疑問(wèn)用 do 或 have的相應(yīng)形式 ,用 do 更常見(jiàn).
You don’t have to go to school on Sundays ,do you
We have to work today ,don’t we (haven’t we )
2 帶 must時(shí)
A 表示“必須”,附加疑問(wèn)部分用 mustn’t
We must work hard ,mustn’t we
B 表示“有必要”時(shí),附加疑問(wèn)部分用 needn’t.
The teacher must show concern for each pupil ,needn’t 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)詞相呼應(yīng).
He must be a teacher,isn’t 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 ,haven’t you
You must have seen him yesterday ,didn’t 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 usedn’t 或didn’t .但口語(yǔ)中傾向于后者.
There used to be an apple tree in the garden ,didn’t there (usedn’t 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 needn’t tell you the answer ,need I
You need to buy a better dictionary ,don’t you
5 帶ought to 時(shí),附加疑問(wèn)用ought.,但在美國(guó)英語(yǔ)中用should
We ought to help each other ,oughtn’t we / shouldn’t we