instruction: Is the next sentence syntactically and semantically acceptable?

What his father wants him to be is more of a man.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John tries to meet not Mary.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The lions ate at the meat raw.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The meeting began at 4 P.M.

response:
acceptable