英语过去式

一般过去时态根据谓语动词的结构可大致分为以下三种.
一、谓语动词含有Be动词（ was/ were ）的,可构成系表结构.一般用来表示主语过去的状态或性质.例如：
I was a student ten years ago .
Lily wasn’t very clever then.
Were they at home at 7:00 pm yesterday?
二、谓语动词含有情态动词（could,would,等）加动词原形的.一般用来表示主语过去的能力、愿望、责任等.例如：
Lily could speak English well then.
He said Tom and Lily would go to the party .
三、谓语动词含有实意动词的.一般用来表示主语过去的经常性、习惯性的动作.例如：
My parents often went to work on foot in the past.