1、定义：表示过去某个时间里发生的动作或存在的状态。常和表示过去的时间状语连用，如：a moment ago，just now，yesterday，last week，this morning等。
如：My brother often went to school by bike last term.
The watch was beside the diary a moment ago.
I watched the moon and ate the moon cakes last Mid-Autumn Festival.
Jim went to the supermarket yesterday.
⑤ 不规则变化 如：
肯定句 否定句 一般疑问句及回答
He watched TV yesterday. He didn’t watch TV yesterday. —Did he watch TV yesterday?—Yes, he did. / No, he didn’t.
They played games just now. They didn’t play games just now. — Did they play games just now?—Yes, they did. / No, they didn’t.