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nancialaid. 問題是到哪找到財政援助。⑷當名詞同位語,如: Tomhadnoideawhichbooktoreadfirst. 湯姆不知道先讀哪本書。⑸當賓語補足語,如: Jimisnotsurewhosetochoose. 吉姆不確定選擇誰的。MaryandJohnarenotcertainwhethertogetmarriedornot. 瑪麗和約翰不確定是否要結(jié)婚。 適用于“疑問詞+不定式動詞”的動詞包括:know,see,decide,tell,ask,consider,discover,explain,forget,guess,hear,imagine,inquire,learn,remember,think,wonder,understand等。 有點值得特別注意的是:當這結(jié)構當賓語時,它的作用等于名詞分句,例如: Icouldnotdecidewhichdictionarytobuy.=IcouldnotdecidewhichdictionaryIshouldbuy.我不能決定買哪本字典。 Jackdidnotknowwheretofindsuchagoodteacher.=Jackdidnotknowwherehecouldfindsuchagoodteacher. 杰克不知道到哪能找到這樣一個好老師。有些動詞,如ask,show,tell,advise,inform,teach等,可以先有個賓語,然后才接著加上適當?shù)摹耙蓡栐~+不定式動詞”結(jié)構。例如: Haveyoutoldhimwheretogettheapplicationform? 你告訴他哪里領申請表了嗎?2. must和have to的用法。區(qū)別1:must多表示主觀需要或責任感的驅(qū)使有必要或有義務去做某事,多譯為“必須”,而have to多表示客觀存在的環(huán)境所限,即客觀要求(無奈)而為之,多譯為“不得不干某事”。例:I must clean the room because it is too dirty.(無人強迫)因為太臟了,我必須要打掃房間。We must be there on time.(責任感的驅(qū)使)我們一定準時到達。I have to do my homework now.(不得不做)我現(xiàn)在不得不做作業(yè)。I have to leave school because my family is poor now.因為家里窮了,我不得不退學。區(qū)別2:must沒有時態(tài)的變化,而have to有時態(tài)的變化。例:Daming was hurt. The doctor said he had to stay in hospital for about two weeks. His father has to go to take care of him. 大明受傷了。醫(yī)生說他大概得住院兩周,他的父親得去照顧他。We don’t have to go to school on Sundays. 星期天我們不必上學。區(qū)別3:must的否定為mustn’t,多表示“禁令”。例:No! You mustn’t turn left! You must turn right into The Strand.不!你不能向左轉(zhuǎn)!你應該向右轉(zhuǎn)進入到strand中。由must引起的疑問句,肯定回答要用must或have to,否定回答要用needn’t或don’t have to,意思是“不必”;此用法在中考中的單選題中容易出現(xiàn)!例:1)—Must I finish my homework before eight o’clock?—Yes, you must.我必須要在8點之前完成作業(yè)嗎?是的,必須。2)—Must I attend the meeting?—No, you needn’t/ don’t have