Q: Valid English sentence (grammatically) or not: This girl in the red coat will put it and a picture of Bill on your desk before tomorrow.

A: acceptable

Q: Valid English sentence (grammatically) or not: I do not think it unreasonable to ask for the return of my subscription.

A: acceptable

Q: Valid English sentence (grammatically) or not: The kennel which Mary made and Fido sleeps in has been stolen.

A:
acceptable