Q: Valid English sentence (grammatically) or not: Mary is faster than John is.
OPTIONS:
- unacceptable
- acceptable

A: acceptable

Q: Valid English sentence (grammatically) or not: That he ever went there alone is certain.
OPTIONS:
- unacceptable
- acceptable

A: unacceptable

Q: Valid English sentence (grammatically) or not: I expected there to be a problem.
OPTIONS:
- unacceptable
- acceptable

A:
acceptable