ago, yesterday, the day before yesterday, last week, last(year, night, month…),in1989,just now, at the age of 5,one day, long long ago, once upon a time, etc.
基本结构
主语 + 动词的过去式或be的过去式+名词。
否定形式
主语 + was/were + not + 其他(在行为动词前加didn't,同时还原行为动词)
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。
例句
She often came to help us in those days.那些天她经常来帮助我们。 I didn't know you were so busy.我不知道你是这么忙。