新东方在线整理了2020考研英语语法，供参考。
一般过去时通常由动词过去式表示。一般过去时的否定式、疑问式和简单回答形式要用助动词do 的过去式did, 同时注意实义动词要用原形。以study 为例，其否定式、疑问式和简单回答形式如下：
| 否定式 |
疑问式 |
|
I did not (didn’t) study…. |
Did I study…? |
|
You did not (didn’t) study…. |
Did you study…? |
|
He did not (didn’t) study…. |
Did he study…? |
|
否定疑问式 |
简单回答 （肯定/否定） |
|
Did I not (Didn’t I) study…? |
Yes, you did. No, you didn’t. |
|
Di you not (Didn’t you) study…? |
Yes, I did. No, I didn’t. |
|
Did he not (Didn’t he) study…? |
Yes, he did. No, he didn’t. |