大學英語四六級考試語法精要（五） 大學英語四六級考試語法精要（五）

 虛擬語氣
    
    1. 表示現(xiàn)在/過去/將來情況的虛擬條件句
    
    虛擬條件句主要有三種結(jié)構(gòu)：
    
    1)　表示與現(xiàn)在情況相反：主句謂語用“would / could / might +動詞原形”，從句謂語用“動詞的一般過去時”（動詞be的過去式一律用were）。
    
    If I were you, I would not accept his offer.
    
    If I had time, I would certainly go to the cinema with you.
    
    2) 表示與過去情況相反：主句謂語用“would / could / might + have +過去分詞”，從句謂語用過去完成時。
    
    If I had got up a little earlier, I wouldn’t have missed the train.
    
    If I had been more careful, I might have passed that exam.
    
    3) 表示與將來情況相反：主句謂語用“would / could / might +動詞原形”，從句謂語用“were +動詞不定式”或“should +動詞原形”。
    
    If I were to do the job, I would not be able to have enough time to study.
    
    If it should rain tomorrow, I would not go out with you.