分析 Mary could swim when she was five.
解答 答案:Mary could swim when she was five.
表达的是过去的事情用一般过去时,表示能做某事用情态动词can的过去式could,后加动词原形swim,故Mary could swim.when引导的时间状语从句,主语she,故was,故答案是Mary could swim when she was five.
点评 when引导时间从句用过去时,主句用过去进行时:表示在从句动作在过去发生时,主句的动作在当时也正在进行.用于表示在过去有两个动作同时发生的情况,或者一前一后即在过去某动作发生时或正在进行中,又有一个动作发生的情况(反之亦然),通常短暂性动词用过去时,持续性动词用过去进行时.
When I got up,my mum was serving breakfast.
When I was having breakfast,my dad went out of home.
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