1、GCT英語語法有關(guān)虛擬語氣的用法 虛擬語氣是一種動詞形式，表示說話人的一種愿望，假設(shè)，懷疑，猜測， 建議等含義，虛擬語氣所表示的含義不是客觀存在的事實。在條件句中的應(yīng)用，條件句可分為兩類，一類為真實條件句，一類為非真實條件句。非真實條件句表示的是假設(shè)的或?qū)嶋H可能性不大的情況，故采用虛擬語氣。 一、虛擬語氣在從句中的使用虛擬語氣即表達不可能發(fā)生或與預(yù)期相反的情況。首先我們應(yīng)熟悉它在三種時態(tài)里的使用情況，這是正確使用虛擬語氣的基礎(chǔ)。這三種時態(tài)是：現(xiàn)在；過去；將來。1、表示現(xiàn)在的虛擬式時 態(tài)從 句 動 詞主 句 動 詞現(xiàn) 在did would + do If I were a bird, I wou

2、ld fly to you. 如果我是只鳥，我就會飛到你身邊去。If it were not for their help, we should be in a very difficult position.如果不是他們的幫忙，我們就會處于一個非常困難的境地。2、表示過去的虛擬式 時 態(tài)從 句 動 詞主 句 動 詞過 去had + donewould + have + doneIf we had started earlier, we should not have missed the train.如果我們早一點動身的話，就不會誤車了。If she hadnt been ill, she

3、might have come. 如果她不是病了，可能會來的3、表示將來的虛擬式 時 態(tài)從 句 動 詞主 句 動 詞將 來should + do were to + dowould + doIf Professor Li should have time tomorrow, we could ask him some questions.如果李教授明天有空的話，我們可以問他點問題。If there should be no air, there would be no living things.如果沒有空氣，就不會有生物。二、錯綜時間的虛擬句通常情況下,在非真實條件句中主句和從句的謂語動詞所

4、指時間是一致的, 但有時也可能指不同的時間,這時要根據(jù)上下文的意思采用不同的謂語動詞形式.If I were you, I would have taken his advice. (從句指現(xiàn)在, 主句指過去)。換成我是你，我就會聽從他的建議。If I had taken my raincoat with me this morning, I would not be wet now. (從句指過去,主句指現(xiàn)在)。如果我今天早上帶了雨衣，現(xiàn)在就不會被淋濕了。If we hadnt been working hard in the past few years, things wouldnt b

5、e going so smoothly.（從句指過去，主句指現(xiàn)在）。如果過去幾年里不努力工作，現(xiàn)在的情況就不會如此順利了。If the weather had been more favorable, the crops would be growing still better.（從句指過去，主句指現(xiàn)在）。如果當(dāng)時的天氣更好點，現(xiàn)在的莊稼就會長得更好。If we had not got everything ready by now, we should be having a more terrible time tomorrow. （從句指現(xiàn)在，主句指將來）如果現(xiàn)在一切還沒準備好，明天情況就更糟了。三、含蓄條件句有時假設(shè)的情況并不以條件從句表示出來,二是暗含在上下文中,比如通過介詞短語來表示。這些介詞常是：but for, without, otherwis等。如：But for your advice, I could not have done it so successfully. 如果不是聽了你的建議，我就不會做的如此成功。The change could not have taken place without the open-door policy.沒有開放的政策，就不會