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---Come and join us.

--- I’m sorry, but I’m busy. If I ________ time, I would go.

A.have                                 B.had

C.will have                              D.have had

 

【答案】

B

【解析】

試題分析:句意:來加入我們吧!——抱歉,但是我正忙著呢。如果我有時間,我會去的。結合語境可知下文從句中是對現在情況的虛擬,故用一般過去時態(tài),選B。

考點:虛擬語氣

點評:虛擬語氣是一種特殊的動詞形式,用來表示說話人所說的話并不是事實,而是一種假設、愿望、懷疑或推測。判斷是真實條件句還是非真實條件句。只有在非真實條件句中才使用虛擬語氣。通過句子意思,看假設的條件是否能夠實現,能夠實現是真實條件句,不能使用虛擬語氣;假設的條件不能實現則是非真實條件句,要用虛擬語氣.判斷這個假設是與哪個事實相反。

1、與現在事實相反

若與現在事實相反,條件從句的謂語用過去式(be通常用were),主句謂語用“should (would, could, might)+動詞原形”

2、與過去事實相反

若與過去事實相反,條件從句的謂語用過去完成時(had+過去分詞),主句謂語用“should (would, could, might)+have+過去分詞”

3、與將來事實相反

若與將來事實相反,條件從句的謂語用過去式(be通常用were),主句謂語用“should (would, could, might)+動詞原形”:

 

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