2、一般过去时
1.定义：过去某个时间里发生的动作或状况；过去习惯性、常常性的动作、行为。
2.时间状语：ago, yesterday, the day before yesterday, last week, last , in 1989, just now, at the age of 5, one day, long long ago, once upon a time,etc.
3.基本结构：主语+动词的过去式或 be 的过去式+名词
4.否定形式：主语+was / were+not+其他；在行为动词前加didnt，同时还原行为动词。
5.一般疑问句：was 或 were 放于句首；用助动词 do 的过去式 did 提问，同时还原行为动词。
eg：
①She often came to help us in those days.那些天她常常来帮助大家。
②I didnt know you were so busy.我不了解你这么忙。
