关于何时使用be动词提问，何时使用助动词提问，可总结如下：
一、be动词提问的适用情况
主系表结构
当句子为“主系表”结构（即谓语为be动词，后接表语）时，需用be动词提问。例如：
- 原句：She is a teacher.
- 疑问句：Is she a teacher？
特殊时态
包括现在进行时、过去进行时、一般将来时及被动语态：
- 现在进行时：He is reading a book. → Are they reading a book？
- 一般将来时：She will call you tomorrow. → Will she call you tomorrow？
- 被动语态：The cake was eaten by the children. → Was the cake eaten by the children？
二、助动词提问的适用情况
实意动词谓语
当句子谓语为实意动词（如have, do, play等）时，需用助动词提问，且需将动词还原为原形。例如：
- 原句：He eats breakfast at 7 AM. → Does he eat breakfast at 7 AM？
- 原句：They played soccer last weekend. → Did they play soccer last weekend？
一般现在时
- 主语为第一/第二人称：I do my homework every day. → Do I do my homework every day？
- 主语为第三人称单数：He does his homework every day. → Does he do his homework every day？
一般过去时
- 用did提问：Did she call you last night？
一般将来时
- 用will或shall提问：Will she finish the project by Friday？
三、注意事项
be动词的特殊性
be动词（am/is/are/was/were）在构成进行时、被动语态及部分特殊句型时，需直接提前提问，无需借助其他助动词。- 避免混淆
助动词仅用于非be动词谓语，若句中已存在be动词，则无需再加助动词。
通过以上规则，可有效区分be动词和助动词在提问中的使用场景。