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

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

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