Q: Valid English sentence (grammatically) or not: When in came Aunt Norris, Fanny stopped talking.

A: unacceptable

Q: Valid English sentence (grammatically) or not: He seems intelligent to study medicine.

A: acceptable

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

A:
acceptable