14.The children have never done that before.(改為反意疑問(wèn)句)
The children have never done that before,havethey?

分析 --孩子們以前從來(lái)沒(méi)有做過(guò). 
--孩子們以前從來(lái)沒(méi)有這樣做過(guò),是嗎?

解答 答案:have they   反意疑問(wèn)句分為兩個(gè)部分,要遵循:"前肯后否,前否后肯"的原則,never表示否定,故后面用肯定式,時(shí)態(tài)是現(xiàn)在完成時(shí),have是助動(dòng)詞,故答案是 have they

點(diǎn)評(píng) 要熟記反意疑問(wèn)句的結(jié)構(gòu),運(yùn)用恰當(dāng)?shù)闹鷦?dòng)詞,有系動(dòng)詞、情態(tài)動(dòng)詞和助動(dòng)詞的可以直接運(yùn)用,如果沒(méi)有必須根據(jù)時(shí)態(tài)、人稱、單復(fù)數(shù)等方面找.

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