instruction: Is the next sentence syntactically and semantically acceptable?

Who did Mary see walking toward the railroad station?

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Lydia pocketed the change in her pocket.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

You British and you Americans pamper yourselves.

response: acceptable

instruction: Is the next sentence syntactically and semantically acceptable?

You're going to hurt yourself one of these days.

response:
acceptable