Q: Valid English sentence (grammatically) or not: The Romans built this aqueduct.

A: acceptable

Q: Valid English sentence (grammatically) or not: The girl who the by works in a skyscraper and in a quonset but has a dimple on her nose.

A: unacceptable

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

A:
acceptable