instruction: Is the next sentence syntactically and semantically acceptable?

Reports of the lettering on the covers of which the government prescribes the height are shocking waste of public funds.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John will enthusiastically have been eating cake.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Mike will sing if you will sing.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

I know several people who she kissed.

response:
acceptable