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一般过去时主要表示过去某时发生的动作或情况。可以从以下几个方面来理解：1)过去某个时间所发生的动作或存在的状态。e.g. I bought a new shirt yesterday. He was a worker two years ago.2)过去一段时间内，经常性或习惯性的动作。e.g. When I was a child,I often played with fire. Li Lei always walked to school last term.3)谈到已故人的情况时多用过去时。e.g. Lu Xun was a great writer.4)有些发生时间不是很清楚的情况，实际是过去发生的，也应用过去时态。e.g. What did you say? 另外，还可用过去时表示委婉的语气。e.g. Could you lend me your pen? 其结构是主语+动词的过去式。be动词的过去式为was, were;行为动词的过去式有规则变化和不规则变化两种，规则变化有以下几种情况：1)直接在动词原形末尾加-ed. e.g. work-----worked; ask------asked; 2)以e结尾的动词只加-d. e.g. arrive-----arrived; like-----liked.3)末尾只有一个辅音字母的重读闭音节,应先双写这个辅音字母,再加-ed. e.g. shop-----shopped; 4)以辅音字母+y结尾的动词,先把y变成i,再加-ed. e.g. carry----carried; study------studied.有些动词变过去式是不规则的,e.g. fly------flew; break-----broke; teach-----taught. 这些需要象生单词一样记住. 其句式变化分为两种情况1)含有be动词的依然在be上做文章. e.g. I was born in 1980. I was not born in 1980. Were you born in 1980? 2)含有行为动词的变否定句要在行为动词前加助动词didnt.,同时把动词变成原形; 变一般疑问句,在句首加助动词did,同时把动词变成原形. e.g. I bought a gift for my mum yesterday. I didnt buy a gift for my mum yesterday. Did you buy a gift for your mum yesterday? | 
