高中英語語法情態(tài)動詞的用法

1、火星學(xué)習(xí)網(wǎng)高中英語語法 情態(tài)動詞的用法一情態(tài)動詞的現(xiàn)在完成式的用法情態(tài)動詞現(xiàn)在完成式主要有兩個功能：表示已經(jīng)發(fā)生的情況和表示虛擬語氣。在這兩個方面must / mustnt; can / cant ; need / neednt; may / maynt; might / mightnt; should / shouldnt;ought等情態(tài)動詞完成式表示的意思是有一定區(qū)別的1表示已經(jīng)發(fā)生的情況。1）must have+過去分詞，表示對已發(fā)生情況的肯定推測，譯為“（昨天）一定”。如：my pain apparent the moment i walked into the room， for

2、the first man i met asked sympathetically：” are you feeling all right？”a must be b had been c must have been d had to be（答案為c）2）cant / couldnt have+過去分詞，表示對已發(fā)生情況的否定推測，譯為“（昨天）一定沒”。如：mary my letter; otherwise she would have replied before now.a couldnt have received b ought to have receivedc has recei

3、ved d shouldnt have received（答案為a）3）may / might have +過去分詞，表示對已發(fā)生的事情做不肯定、可能性很小的推測，或事實上根本沒發(fā)生，譯為“也許”。如：at florida powers crystal river plant， a potentially serious leakage of radioactive water may have been unknowingly caused by an electrician.2表示虛擬語氣。1） neednt have + 過去分詞，表示做了不必做的事，相當(dāng)于”didnt need to

4、do”，譯為“其實沒必要”。如：you neednt have come over yourself.as it turned out to be a small house party， we _so formally.a neednt dress up bdid not need have dressed upc did not need dress up d neednt have dressed up（沒有必要穿的那么正式，體現(xiàn)是說話者的建議，實際結(jié)果是否真的穿的很正式?jīng)]有確定，答案為d）2）should have +過去分詞，表示應(yīng)該做某事但實際上未做，譯為“本應(yīng)該”should n

5、ot + have過去分詞表示本不應(yīng)該做某事但實際上做了，譯為“本不應(yīng)該”。如：i regret having left the work unfinished; i should have planned everything ahead carefully.我本來應(yīng)該事先認(rèn)真地把每件事情規(guī)劃的很好，但實際上作者還是沒有規(guī)劃好，以至工作沒有完成。3） ought to have +過去分詞，表示動作按理該發(fā)生了，但實際上未發(fā)生，譯為“該”，與should 的完成式含義類似。如：the porter ought to have called the fire-brigade as soon a

6、s he saw the fire in the stock， which went up in smoke 。4）could have +過去分詞，表示過去本來可以做但卻未做，譯為“完全可以”。這點與ought/should/ have +過去分詞用法相似。如：what you said is right， but you could have phrased it more tactfully.5） may/ might have +過去分詞，表示過去可以做但實際未做，譯為“（那樣）也許會”。如：it might have been better to include more punch

7、y statistics and photos of equipment in the introduction to further assist first-time office automation managers. 二幾個情態(tài)動詞?？嫉木湫停?）may/might （just） as well “不妨，最好”，與had better相近；since the flight was cancelled， you might as well go by train.既然航班已經(jīng)取消了，你不妨乘火車吧。相當(dāng)于you had better go by train。2）cannot / can

8、ttoo “越越好，怎么也不過分”。注意這個句型的變體cannotover。如：you cannot be too careful when you drive a car.駕車時候，越小心越好。the final chapter covers organizational change and development. this subject cannot be over emphasized 。3）usednt 或didnt use to 為used to （do） 的否定式。4）should 除了“應(yīng)該”一層意思外，考研(論壇) 大綱還規(guī)定要掌握其“竟然”的意思。如：i didnt expect that he should have behaved like that. 我無法想象他竟然這樣做三情態(tài)動詞被動關(guān)系的主動表達(dá)法1 want， require， worth（形容詞）后面接doing也可以表示被動意義。your hair wants cuttingthe book is worth readingthe floor requires washing.2need既可以用need to be done 也可以使用n