The guest room_______.A. needn’t to be cleaned B. doesn’t need cleaningC.needs not to be cleanedD.needn’t cleaning

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1) eddoNeedn’tdoNeedsbdo…。?Needn’tsbdo……?2)Verb。NeedtodoNeedstodoNeededtodoDoesn’tneedtodoDosbneedto…。?Doesn’tsbneedto…?Theguestroom_______。 edn’ esn’ edn’ ’tbecleaned(modalverb)doesn’tneedtobecleaned(verb。)B:doesn’tneedtobecleaned=doesn’tneedcleaning(needdoing=needtobedone,實(shí)義動(dòng)詞)Themachineneedsrepairing。=Themachineneedberepaired。(modalverb。)=Themachineneedstoberepaired。C:doesn’ edn’ttobecleaned(modalverb)Needn’tdoing(x)(B)。

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1 情態(tài)動(dòng)詞后面可以加to么？不可以..那么排除A2 情態(tài)動(dòng)詞右面動(dòng)詞用ing合適么？排除D3 情態(tài)動(dòng)詞有人稱(chēng)變化么？沒(méi)有，那么C中的need就貌似應(yīng)該是普通的實(shí)意動(dòng)詞，普通動(dòng)詞可以直接加not否定么？不可以..所以排除C然后就剩下B可選了

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答案：B.因?yàn)楫?dāng)物為主語(yǔ)，need,want,require+doing/to be done 表被動(dòng)動(dòng)作。(Believe me. I'm a teacher of English,teaching in Senior 3 at present.)

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若need前有助動(dòng)詞或者有人稱(chēng)變化,那就是說(shuō)它是一個(gè)實(shí)義動(dòng)詞,它后得加to do;若沒(méi)有人稱(chēng)時(shí)態(tài)的變化,否定式直接加not,那么它是情態(tài)動(dòng)詞,就得加動(dòng)詞原形了本題中的ABD選項(xiàng)都犯了同樣的錯(cuò)誤,即既把need當(dāng)成是實(shí)義動(dòng)詞,又把它當(dāng)成是情態(tài)動(dòng)詞

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此題答案是:B.理由: need+doing 等于need to be done.doing與need的主語(yǔ)是被動(dòng)關(guān)系,如: My hair needs cutting,等于 My hair needs to be cut.另外: need當(dāng)情態(tài)動(dòng)詞時(shí),用在疑問(wèn)句或否定句中. need當(dāng)實(shí)意動(dòng)詞時(shí),后面可跟,名詞或代詞,或doing,to do做賓語(yǔ),疑問(wèn)或否定時(shí),用其他助動(dòng)詞.

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英語(yǔ)會(huì)造一個(gè)句子就很容易做類(lèi)似的題目。比如，I need your help.對(duì)得上號(hào)的就是第二個(gè)了。另外3個(gè)選項(xiàng)都是情態(tài)動(dòng)詞，后面必然要接動(dòng)詞原形。怎么區(qū)分它是實(shí)意動(dòng)詞還是情態(tài)的呢。我們聽(tīng)過(guò)must not,沒(méi)聽(tīng)過(guò)does't must.對(duì)號(hào)入座，need not表示它是情態(tài)動(dòng)詞，doesn't need 則是實(shí)意的。希望，能幫到你。