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      虛擬條件句難點(diǎn)巧掌握

      2009-05-22 06:32
      關(guān)鍵詞:虛擬語氣陳述時態(tài)

      李 芹

      虛擬語氣作為高考難點(diǎn)一直讓許多學(xué)生頭痛不已,非真實(shí)條件句中虛擬語氣的考察更是重點(diǎn).許多語法書上對虛擬的講解總是涉及時態(tài),筆者認(rèn)為這極不利于學(xué)生對此知識點(diǎn)的理解與運(yùn)用. 筆者在教學(xué)實(shí)踐作了一些嘗試,起到了不錯的效果。

      一、拋開時態(tài)學(xué)虛擬

      張道真實(shí)用英語語法對虛擬語氣的定義如下: 在表示一種純?nèi)患傧氲那闆r或主觀愿望時,動詞需用一種特殊形式,成為虛擬語氣. 時態(tài)與時間有密切關(guān)系,而虛擬語氣實(shí)際是對真實(shí)情況的假設(shè),因此其表達(dá)方式必須與正常時態(tài)的表達(dá)有區(qū)別.因此,拋開時態(tài),把其作為一種特殊表達(dá)方式來理解更容易掌握其規(guī)則.如下表中,用had done 結(jié)構(gòu)表示對過去事實(shí)的虛擬表達(dá),而不用過去完成時這一概念。因此,在學(xué)習(xí)虛擬語氣時,牢記三個時間段:過去,現(xiàn)在和將來。

      以下句為例:She would have said more if he _______(walk) away. 從would have said可看出整個句子時間為過去,因此,按照規(guī)則,空格處應(yīng)為had done結(jié)構(gòu),再結(jié)合句意,應(yīng)為否定,最終正確答案had not walked 就表達(dá)出來了。

      二、善于發(fā)現(xiàn)含蓄的條件

      許多同學(xué)誤以為虛擬條件只有if可以引導(dǎo),其實(shí)不然。

      1. without, but for 可引導(dǎo)相當(dāng)于的if條件。例:

      But for your help, I couldnt have succeeded.等于If you hadnt helped me, I couldnt have succeeded.

      2. or, otherwise 相當(dāng)于if條件。例:

      He hesitated for a moment before kicking the ball, otherwise he would have scored a goal. 此題中,otherwise 就等于if he hadnt hesitated.

      3. 真實(shí)情況暗含的虛擬條件

      虛擬語氣的表達(dá)十分靈活,學(xué)生要善于發(fā)現(xiàn)真實(shí)情況下暗含的言外之意。同一個句子中,既有虛擬語氣,又有陳述語氣。例:

      I would go to the concert but I have no time. 從I have no time 可知其言外之意if I had time, I would go to the concert..

      4. 從句也可用if it were not for /if it had not been for(若不是)來構(gòu)成謂語。

      If it were not for your help, we would be in serious trouble.

      If it had not been for your help , we would have been in serious trouble.

      三、倒裝問題的解決

      虛擬語氣中倒裝問題一直是高考熱點(diǎn),也是學(xué)生易錯的題型,實(shí)際上,既然可以倒裝,就可以不倒裝,許多同學(xué)更習(xí)慣讀不用倒裝的句子,即用陳述語序表達(dá)的句子。例:

      Should it rain, I would stay at home tomorrow.此題中should一詞令許多同學(xué)出錯,而在下句中 If it should rain, I would stay at home tomorrow. 卻很少有同學(xué)出錯。

      再如:______ I in your position, I would go.先變?yōu)?If I were in your position, I would go。再進(jìn)行倒裝,就容易多了。因此,看到倒裝題時,先變?yōu)殛愂鼍洹?/p>

      四、虛擬還是不虛擬

      有時可以用虛擬語氣,也可以不用虛擬語氣,兩種情況有時同時考察到。主句的謂語有時可用祈使語氣,或用陳述語氣。例:

      If it should rain tomorrow, we would not go shopping. 也可以用下句表達(dá)

      If it rains tomorrow, we will not go shopping.

      If you should have any difficulty in getting the medicine, (you could) ring this number.

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