一般過去時：
1．概念：過去某個時間里發生的動作或狀態；過去習慣性、經常性的動作、行為。
2．時間狀語：ago，yesterday，the day before yesterday，last week，last(year，night，month…)，in 1988，just now，at the age of 5，one day，long long ago，once upon a time，etc.
3．基本結構：be動詞；行為動詞的過去式
4．否定形式：was/were+not;在行為動詞前加didn't，同時還原行為動詞。
5．一般疑問句：was或were放于句首；用助動詞do的過去式did 提問，同時還原行為動詞。
6．例句：She often came to help us in those days.
I didn't know you were so busy.我不知道你這么忙。