instruction: Is the next sentence syntactically and semantically acceptable?

He kept some girls who had been injured in the wreck company.

response: unacceptable


instruction: Is the next sentence syntactically and semantically acceptable?

Phineas knows a girl who is behind Maxime.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

Mary knows that John was elected.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

I'm surprised we had any potatoes.

response:
acceptable