A question that is free of any grammatical or logcal errors, should be labeled 'yes', otherwise it should be indicated as 'no'. A question is grammatically correct if all its entities i.e. nouns, verbs, adjectives, prepositions, pronouns, adverbs are at appropriate position. A question is logically correct if the semantic makes sense.

Example input: Sentence: Jack played basketball after school, after which he was very tired. 
Question: How long did Jack play basketball?
Example output: Yes.
Example explanation: All entities are in appropriate position and the question makes sense, so its grammatically and logically correct.
Q: Sentence: In school, Atta came across as very intelligent and reasonably pleasant, with an excellent command of the German language. 
Question: How long was Atta in the school?
A:
Yes.