instruction: Is the next sentence syntactically and semantically acceptable?

Heidi investigated that John ate the cauliflower.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

He impresses his friends all as pompous.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

We elected employer president the boy's guardian's.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John remained a student.

response:
acceptable