instruction: Is the next sentence syntactically and semantically acceptable?

Which boy's guardian's did we elect employer president?

response: unacceptable


instruction: Is the next sentence syntactically and semantically acceptable?

The mouse nibbled on the cheese.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

John is more embarrassed, the more pictures of himself that appear in the news.

response: acceptable


instruction: Is the next sentence syntactically and semantically acceptable?

Who was the book sent by John.

response:
unacceptable