八年級上冊Unit5Doyouwanttowatchagameshow不定式講解及練習(xí)

1、動詞不定式 動詞不定式由“to 動詞原形”構(gòu)成，有時可以省略to。動詞不定式在句中可作賓語、賓語補足語、狀語、定語等。動詞不定式在句子中不作謂語，所以沒有人稱、數(shù)和時態(tài)的變化，其否定式是在to前加上not。如：ask sb. not to do； tell sb. not to do；具體用法見下表：不定式結(jié)構(gòu)作主語如果不定式較長，顯得頭重腳輕，則可由代詞it作形式主語(形式主語it不可由that或this等其他代詞代替)，而將不定式放到后面。不定式結(jié)構(gòu)所表示的動作是誰做的，即不定式的邏輯主語，通?？梢酝ㄟ^It is + adj. + for sb. to do sth. 在某些形容詞(如ca

2、reless，clever，considerate，foolish，good，impolite，kind， naughty，nice，silly，stupid等)作表語時，不定式后可以加of來引導(dǎo)出其邏輯主語It is + adj. + of sb. to do sth. 不定式作賓語不定式作賓語有兩種：一種是及物動詞后直接跟帶to的不定式， 另一種是“及物動詞+疑問詞+帶to的不定式。及物動詞+帶to的不定式結(jié)構(gòu):只能跟動詞不定式的動詞，常見的有: afford， agree， aim， appear， ask， believe， care，claim，decide demand， desi

3、re， determine， expect， fail， happen， hesitate， hope， intend， learn， long， manage， offer， pretend， promise， prepare， refuse， seek， swear， undertake，want， wish等?？谠E：同意提出做計劃,要求答應(yīng)來幫忙。準(zhǔn)備決定遭拒絕,敢于選擇有希望。不能做到莫假裝,設(shè)法做成決心堅。不定式做表語一種情況為主語是不定式(表示條件)；表語也是不定式(表示結(jié)果)：To see is to believe.另一種情況為主語是以aim，duty，hope， idea，j

4、ob， plan，problem， purpose，thing，wish等名詞為中心的短語，或以what引導(dǎo)的名詞性從句，不定式表語對主語起補充說明作用：不定式作定語 不定式結(jié)構(gòu)作名詞詞組修飾語主要有三種類型：第一種，被修飾的名詞詞組是不定式的邏輯賓語。如果不定式是不及物動詞，后面就得加相應(yīng)的介詞。例如： needs a friend to play with第二種，被修飾的名詞詞組是不定式的邏輯主語；例如： you got a key to unlock the door?5)不定式作狀語不定式結(jié)構(gòu)在句中作狀語通常都能轉(zhuǎn)換為限制性狀語從句。例如作原因狀語： are quite surpris

5、ed to see the great changes taking place in the area6)作賓語補足語在teach，ask 等動詞之后用不定式作賓補。在let，make和have之后用省略to的不定式作賓補( ) 1. _ the seeds and they will grow.A. Water B. To water C. Watering D. Watered( ) 2. The purpose of the scheme is not to help the employers but _ work for young people.A. provide B. to

6、provide C. providing D. provided( ) 3. He arrived at the office early, _ a good example to the others.A. set B. to set C. to be set D. having set( ) 4. Please make my excuse at tomorrows meeting Ive got too much work _.A. to do to comeB. doing comingC. to do comingD. to do coming( ) 5. We looked eve

7、rywhere for the keys, but they are nowhere _A. to findB. to have found C. to be found D. being found( ) 6. After describing the planned improvements, she went on _ how much they would cost.A. to explain B. explaining C. to be explainingD. having explained( ) 7. To test eggs, _ them in a bowl of wate

8、r: if they float theyre bad, if they sink theyre good.A. put B. putting C. to put D. to be putting( ) 8. Please remember _ the plants while Im away.A. wateringB. to be wateringC. to water D. being watering( ) 9. _ wine, first you must press the grapes.A. Making B. To makeC. To be making D. Makeith you, Jim or Jack?A. have go B. h