构成: Tom came to China last year. He was a student 3 years ago. They were all at home yesterday.
1. 谓语为一般动词时: 主语 + 动词过去式 + 其他
2. 谓语为be 动词时: 主语+ be (was, were) + 其他
The past simple tense 一般过去时
考点梳理