When do interrogative sentences and negative sentences return to their original forms I want to know under what tense the verbs in interrogative and negative sentences are restored to their original forms? Under what tense do verbs in interrogative and negative sentences need not be restored Which words must be followed by the original verb form?

The verbs in interrogative and negative sentences are prototypes
Modal verbs follow the original form

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1. How do verbs change in interrogative sentences and negative sentences Do the verbs in interrogative sentences and negative sentences basically change into their original forms? (excluding special cases) Or according to the tense of the sentence? Do you keep the verbs in their original form when you use do and does?
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3. In which interrogative sentence should the verb be reduced Please give some examples at the beginning of "does, can" and "special questions" to explain in which sentence the verb should be restored,
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