1.概念: 过去某个时间里发生的动作或状态;过去习惯性、经常性的动作、行为;<br>2.时间状语: ago, yesterday, the day before yesterday, last week,last(year, night, month…), in 1989, just now, at the age of 5, one day, long ago, once upon a time, etc.<br>3.基本结构: be动词;行为动词 的过去式<br>4.否定形式 :was/were+not;在行为动词前加didn't,同时还原行为动词.<br>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.<br>6.例句: She often came to help us in those days.