Detailed Instructions: 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.
See one example below:
Problem: Sentence: Jack played basketball after school, after which he was very tired. 
Question: How long did Jack play basketball?
Solution: Yes.
Explanation: All entities are in appropriate position and the question makes sense, so its grammatically and logically correct.

Problem: Sentence: The NMCC learned about United 93 from the White House. 
Question: Is United 93 still operational?
Solution:
Yes.