Q: Valid English sentence (grammatically) or not: John had carefully studied Russian.
OPTIONS:
- unacceptable
- acceptable

A: acceptable

Q: Valid English sentence (grammatically) or not: Which man did you talk?
OPTIONS:
- unacceptable
- acceptable

A: unacceptable

Q: Valid English sentence (grammatically) or not: Louise likes not being happy, doesn't she?
OPTIONS:
- unacceptable
- acceptable

A:
acceptable