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大學英語四級語法考點解析（上）
語法一直是大學英語考試中同學們的攔路虎，同學們可以和小編一起看看大學英語語法考點解析，以提高語法的答題能力!
大學英語四級語法考點解析一：倍數(shù)增減的表示法
1) Force N1 _______________(比力N2大2.5倍).
2) This substance _______________(反應速度是另外那種物質(zhì)的三倍).
3) The earth ______________(是月球大小的49倍).
4) The landlord _______________(想將租金提高三分之一).
5) They _______________(計劃將投資增加一倍).
答案解析：
1) is 2.5 times greater than Force N2 (考點：倍數(shù) + 形容詞/副詞比較級 + than)
2) reacts three times as fast as the other one (考點：倍數(shù) + as + 形容詞/副詞 + as)
3) is 49 times the size of the moon (考點：倍數(shù) + 名詞)
4) wants to raise the rent by a third (考點：動詞 + by + 數(shù)詞/百分比/倍數(shù))
5) plan to double their investment (考點：double + 名詞)
大學英語四級語法考點解析二：時態(tài)
1) Be quick, _______________(否則等我們到達教堂婚禮就結束了).
2) When she got home, _______________(孩子們已經(jīng)睡著了).
3) When I prepare for the college entrance examination, ___________(我姐姐將在海邊度假).
4) I_______________(一上午都在修改我的簡歷).
5) He joined the army in October, 2001. _______________(他參軍已五年了).
答案解析：
1) or the wedding will have finished by the time we get to the church (考點：將來完成時)
2) the children had fallen asleep (考點：過去完成時)
3) my sister will be taking her vacation at the seaside (考點：將來進行時)
4) have been revising my resume all the morning (考點：現(xiàn)在完成進行時)
5) He has been in the army for 5 years (考點：1. 現(xiàn)在完成時;2.要用持續(xù)性動詞才能接一段時間)
大學英語四級語法考點解析三：被動語態(tài)
1) The blackboard and chalk _______________(正在被電腦和投影機所取代).
2) The book __________(到今年年底就將已出版).
3) Computer models _______________(可以用來演示細胞工作的方式).
4) When the bill of fare was brought, _______________(我驚呆了，價格大大超出了我的預料).
5) _______________(必須立即采取有效措施)to eliminate sandy storms.
答案解析：
1) is being replaced by the computer and the projector (考點：被動語態(tài)的現(xiàn)在進行時)
2) will have been published by the end of this year (考點：被動語態(tài)的將來完成時)
3) can be used to demonstrate the way that cells work
(考點：1. 被動語態(tài)與情態(tài)動詞聯(lián)用; 2. 漢語有些沒有“被”字等標志詞的句子也表示被動, 要譯成英語的被動語態(tài))
4) I was startled, for the prices were a great deal higher than I had anticipated (考點：同“3”的考點2)
5) Effective measures must be taken immediately (考點：漢語的無主句通常翻譯成英語的被動語態(tài))
大學英語四級語法考點解析四：情態(tài)動詞
1) The phone is ringing, _______________(但是沒人接聽。她一定不在家).
2) I can’t find my sunglasses. _______________(我可能昨天落在咖啡店里了).
3) You screamed in your sleep last night. ______________(你一定夢見什么可怕的東西了).
4) It’s a pity. _______________(你本應該邀請她來參加你的畢業(yè)典禮的).
5) _______________(其實我沒必要穿上我最好的套裝去參加那次聚會的); most of the guests were wearing jeans and sweaters.
答案解析：
1) but there is no answer. She can’t be at home (考點：情態(tài)動詞可表示可能性，can’t 表示“一定不”)
2) I may have left them in the coffee shop yesterday(考點：“情態(tài)動詞can/could, may/might, must + 完成式”用于表示對過去發(fā)生的動作的主觀判斷)
3) You must have dreamed of something terrible (考點：同上)
4) You should have invited her to your graduation ceremony (考點：“情態(tài)動詞should/ought to + have done” 用于評論過去應該做而實際并未做的動作，含有批評的意思)
5) I needn’t have put on my best suit to go to the party (考點：“情態(tài)動詞needn’t + have + done”表示對過去發(fā)生的動作進行評論，認為“無須發(fā)生”，“不必做”)
大學英語四級語法考點解析五：虛擬語氣
1) I wish _______________(我年輕的時候有你們這樣的機會).
2) If only _______________(他知道這病是可以治好的)! Then he would not have killed himself.
3) —— Would you like him to paint your door with yellow stars?
—— I’d rather he _______________(漆成藍色的，而且不帶任何裝飾).
4) It’s high time that _______________(采取措施解決交通堵塞的問題).
5) Hugh usually talks _______________(仿佛在大會上發(fā)表演說似的).
6) We insist that ___________(讓杰克立刻進醫(yī)院).
7) It was advised that _______________(在居民區(qū)設立更多的流動商店).
8) His proposal was that _______________(他們成立一個專門委員會來檢查這個問題).
9) We are going to discuss his suggestion that _______________(取消期中考試).
10) It is ridiculous that _______________(我們在一個總是下雨的國家還缺水)
答案解析：
1) I had had your opportunities when I was young
(考點：I wish后的that從句中用過去完成式表示過去沒有實現(xiàn)或不可能實現(xiàn)的愿望)
2) he had known this disease is curable
(考點：If only 引導的感嘆句表示“但愿”或“要是……就好了”，用法與 I wish…基本相同)
3) painted it blue, and without any decorations
(考點：would rather 后的that從句中用過去式表示不是事實)
4) measures were taken to solve the problem of traffic jams
(考點：It’s (about/high) time 后的that從句中用過去式，表示“該是……的時候了”)
5) as though he were delivering a speech at an assembly
(考點：as if / as though引導的從句中用過去式表示和現(xiàn)在事實相反或?qū)ΜF(xiàn)在情況有所懷疑)
6) Jack (should) be sent to hospital right now
(考點：表示“建議、命令、要求、想法”的動詞所接的賓語從句通常用“(that) sb. (should) do”的虛擬形式)
7) more mobile shops (should) be set up in the residential area
(考點：表示“建議、命令、要求、想法”的動詞所接的主語從句通常用“(that) sb. (should) do”的虛擬形式)
8) they (should) set up a special board/committee to examine this problem
(考點：表示“建議、命令、要求、想法”的名詞所接的表語從句通常用“(that) sb. (should) do”的虛擬形式)
9) the mid-term exams (should) be canceled
(考點：表示“建議、命令、要求、想法”的名詞所接的同位語從句通常用“(that) sb. (should) do”的虛擬形式)
[表示“建議、命令、要求、想法”的動詞及其名詞常見的有：advise (advice), agree (agreement), decide (decision), decree, demand, determine (determination), grant, indicate (indication), insist (insistence), order, prefer (preference), propose (proposal), request, require (requirement), resolve (resolution), stipulate (stipulation), suggest(suggestion), urge, vote;常見的這類動詞還有：allow, arrange, ask, beg, concede, demonstrate, ensure, intend, move, pledge, pray等]
10) we (should) be short of water in a country where it is always raining
(考點：在It is/was +形容詞后的that從句中常用“sb. should do”的形式表示建議驚奇等。這類形容詞常見的有：advisable, anxious, appropriate, compulsory, crucial, desirable, eager, essential, fitting, imperative, important, impossible, improper, natural, necessary, obligatory, preferable, proper, urgent, vital, willing等)
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