Unit 4 What would you do教案

 women必須把那個班分成幾個小組。
 
三、語法
虛擬語氣   subjunctive mood（一）
虛擬語氣在條件從句（protasis）中的用法：
條件從句有兩類：
真實條件句；
虛擬條件句。
如果假設情況有可能發生的，就是“真實條件句”。
eg.if time permits,we’ll go fishing together.
  如果有時間的話，我們就一起去釣魚。
如果假設的情況與事實相反，則為“虛擬條件句”。
eg.if it had rained yesterday,we would have stayed at home.
  如果昨天下雨的話，我們就會留在家里。
（事實是：昨天沒有下雨，我們外出了）
一）虛擬語氣在非真實條件句中的應用
閱讀：
1.if i were you，i’d wear a shirt and tie.
2.if we had found her address，we would have written her.
3.what would you do if you won the lottery？
4.what would you do if there should be(were to be)an accident?
5.if it had not been for your help，we should not have succeeded.
6.if we had been given more time，we could have done it better.
7.if you had not helped me，i wouldn’t have passed the exam.
 
 
提示：
   1.在從句中，be動詞多用were的形式。在口語中，如果主語是第一、第三人稱單數的話，be動詞可用was，但人們總是說：if i were you…
   2.主句中的謂語可以由would，should，could和might這四個不同的情態動詞來構成。
   3.與將來事實相反的條件從句中，謂語有三種不同的形式：過去式、were+to do或should+do。
實例解讀：
 與現在事實相反的假設（事情的發生都在同一時間內）；
 1.if i were you，i should buy it.
  （如果我是你，我就會買了它。）
  （從句用過去式動詞were，主句用should buy）
 2.if i had time，i would study french.
  （如果有時間，我會學習法文。）
  （從句用過去式動詞had，主句would study）
 3.if she knew english，she would not ask me for help.
  （如果她懂英文，她就不必要我幫了。）
  （從句用過去式動詞knew，主句用would not ask）
 與過去事實相反的假設（假設從句的事實為過去的事）：
 1.if you had studied harder last term，you could have passed exam.
 （從句動詞用had studied，主句動詞用could have passed）
  如果你在上個學期用功一，你就會在考試中過關了。
 2.if you had taken my advice，you wouldn’t have failed in the exam.
 （從句動詞用had taken，主句動詞用wouldn’t+have failed）
  如果你當時聽從我的勸告的話，你就不會在考試中失敗了。
 3.if it had snowed，i would have skied in the park.
  （從句動詞用had snowed，主句動詞用would have skied）
   如果下雪的話，我就可在公園里滑雪了。
 與將來的事實可能相反（對將來的事實實現的可能性不大）：
 1.if it should rain，the crops would be saved.
  （從句動詞用should rain，主句動詞用would be）