一般过去式结构：有其特定的时间状语肯定句：主语+动词过去式+其他例如：I went to the park yesterday. i was happy yesterday.否定句：主语+didnt +行为动词原形+其他 主语+was/ were+ not+其他例如：i didnt come back yesteday.I wasnt at home last night.一般疑问句：Did +主语+行为动词原形+其他Was/ Were +主语+其他例如：Did you have fun in Beijing? Yes, i did. / No, I didnt.Were you at school at that time? Yes, I was./ No, I wasnt.特殊疑问句：疑问词+一般疑问句例如：What did you do yesterday? I did my homework一般现在式结构：肯定句：主语+动词原形+其它 否定句：主语+dont+动词原形+其它 疑问句：Do+主语+动词原形+其它肯定回答：yes
