11.16 用一般過(guò)去時(shí)代替完成時(shí)
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1) 兩個(gè)動(dòng)作如按順序發(fā)生,又不強(qiáng)調(diào)先后,或用then,and,but 等連詞時(shí),多用一般過(guò)去時(shí)。
   When she saw the mouse,she screamed.
   My aunt gave me a hat and I lost it.

2 ) 兩個(gè)動(dòng)作相繼發(fā)生,可用一般過(guò)去時(shí);如第一個(gè)動(dòng)作需要若干時(shí)間完成,用過(guò)去完成時(shí)。
   When I heard the news, I was very excited.

3) 敘述歷史事實(shí),可不用過(guò)去完成時(shí),而只用一般過(guò)去時(shí)。
   Our teacher told us that Columbus discovered America in 1492.