Is "been" not used in negative sentences of future perfect continuous tenses?

Dear Student,
The solution to your query is as given below:

In negative sentences, the word 'not' is added inside the helping verb making it 'will not have been'. Subject + will not have been + (1st form of verb + ing) + since/for time. Example: She will not have been working in the factory since 30th November.

To describe something that will not be completed over a certain span of time into the future, we make the future perfect continuous tense negative by adding not after the modal verb will (usually contracted as won't).

Regards!

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