定义 / 说明
在 Past Simple 中，疑问句和否定句用 did。这和肯定句不同，肯定句里主句动词常是过去式，如 worked、played。在 did 或 didn't 后，主句动词要回到原形。这个规则很关键，因为学习者常会把两个过去形式一起用错。
关键规则
- 否定句用 did not / didn't + base verb。
- 疑问句用 Did + subject + base verb...?
- did/didn't 后主句动词不用过去式。
- 所有主语都用同一个助动词：I did, she did, they did。
- 主句动词是 be 时不用 did，要用 was/were。
例句
- Did you call him yesterday? - 你昨天给他打电话了吗？
- I didn't understand the question. - 我没理解这个问题。
- Did she work on Saturday? - 她周六上班了吗？
- They didn't stay long. - 他们没待太久。
- Did your parents visit you last month? - 你父母上个月来看你了吗？
常见错误
- ❌ Did you called him? -> ✅ Did you call him?
- ❌ She didn't went to work. -> ✅ She didn't go to work.
- ❌ Did he was late? -> ✅ Was he late?
提示
- 句子里如果已经有 did，主句动词通常要用原形。