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.
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