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1) 两个动作如按顺序发生,又不强调先后,或用then,and,but 等连词时,多用一般过去时。 when she saw the mouse,she screamed. my aunt gave me a hat and i lost it. 2 ) 两个动作相继发生,可用一般过去时;如第一个动作需要若干时间完成,用过去完成时。 when i heard the news, i was very excited. 3) 叙述历史事实,可不用过去完成时,而只用一般过去时。 our teacher told us that columbus discovered america in 1492. |
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