instruction: Is the next sentence syntactically and semantically acceptable?

Ellen and Helen conferred together.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

John offered, and Harry gave, Sally a Cadillac.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

Guinevere has a single bone that is in every corner of the house.

response: unacceptable

instruction: Is the next sentence syntactically and semantically acceptable?

The man who was arrested by Officer Bob went mad.

response:
acceptable