could加动动词做谓语的一般过去时

Question

在英语中,由谓语动词 be 构成的一般过去时 和 行为动词一般过去时 有什么区别?
下面句子中的 did 能否换成 were.
Did you watch TV yesterday evening?

Answer 1

1.由 be 来作谓语动词的句子属于“主系表”句型,其一般过去时要把 be 变成 was 或 were.例如 I was a student.They were in the park yesterday.
2.这种句型的否定式是在 was / were 后面加 not.例如 They were not in the park yesterday.
3.这种句型的疑问式要把 was / were 提到主语之前构成倒装句.例如 Were they in the park yesterday?
4.由行为动词作谓语的句子属于“主谓宾”句型,其一般过去时要使用动词的过去式.例如 I watched TV yesterday evening.
5.这种句型的否定式要在行为动词前加助动词的否定形式 did not.例如 I did not watch TV yesterday evening.注意：有了助动词 did 后,行为动词要用原形.
6.这种句型的疑问式要在主语前加助动词 did.例如 Did you watch TV yesterday evening?注意：有了助动词 did 后,行为动词要用原形.
7.助动词 did 只能用于“主谓宾”句型,所以 Did you watch TV yesterday evening?中的 did 不能换成 were.