instruction: Is the next sentence syntactically and semantically acceptable?

What John could do is not visit Sally.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Him, they let him go yesterday.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The police kept tabs on the suspect.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Smith threw the first baseman the ball.

response:
acceptable