将英语中第三人称过去时的陈述句转换为一般问句，需遵循以下规则：

一、基本规则

添加助动词

在句首添加助动词 did，并将原句中的过去时动词还原为原形。

调整语序

将助动词 did放在句首，后续句子成分按原序排列。

二、具体步骤

识别动词类型

若原句为 be动词（was/were）过去时：

例：He was a student. → Was he a student？

若原句为 实义动词过去时

例：He liked watching TV. → Did he like watching TV？

注意：若原句为 情态动词过去时（如could/would），则直接将情态动词提前。

处理其他变化

将 he/she/it改为 he/she/it did

将 was/were改为 was/were（保持不变）。

三、注意事项

be动词过去时：

仅用于描述状态，如：

The cake was delicious. → Was the cake delicious？

实义动词过去时：需用 did提问，且动词恢复原形，如：

The cat chased the mouse. → Did the cat chase the mouse？

特殊动词：如 have/has，需用 did提问并还原为原形：

Tom had lunch already. → Did Tom have lunch already？

四、示例总结

| 陈述句 | 一般问句 |

|--------|----------|

| He was late. | Was he late？ |

| She watched a movie. | Did she watch a movie？ |

| They finished homework. | Did they finish homework？ |

通过以上规则，可系统地将第三人称过去时的陈述句转换为一般问句。