一般过去式结构：有其特定的时间状语：主语+动词过去式+其他例如：I went to the park . i was happy .：主语+didnt +原形+其他 主语+was/ were+ not+其他例如：i didnt come back yesteday.I wasnt at home last night.：Did +主语+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.：+例如：What did you do ? I did my homework一般现在式结构：肯定句：主语+其它 否定句：主语+dont+其它 疑问句：Do+主语+其它肯定回答：yes,主语+do/does.否定回答：N0, 主语+do/does+not：+ 当主语是时： 肯定句：主语+动词（词尾加s或es）+其
