Here's the structure:
Auxiliary verb + negative (not) + adverb of frequency (usually) + main verb + ... ?
Example:
* Do you usually not eat breakfast?
* Doesn't she usually go to the gym?
* Haven't they usually been happy?
Important Note: When using "do/does/did" in negative interrogatives, "usually" can sometimes be placed after the main verb, but it's less common. For example:
* Do you not eat breakfast usually? (less common)
* Doesn't she go to the gym usually? (less common)
However, it's always grammatically correct and more natural to place "usually" before the main verb in negative interrogative sentences.