instruction: Is the next sentence syntactically and semantically acceptable?

Mary speaks so much gently.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Don't be silly!

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John leave for Seoul tomorrow?

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

He became fond of peanuts.

response:
acceptable