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: On London's Stock Exchange, Reuters shares rose five pence to 913 pence ($14.43). 
Question: How often does it rise?
Example Output: No.

Example Input: Sentence: She told me that she was heading for a drink and slipped out of the crowd. 
Question: When did she have a drink?
Example Output: Yes.

Example Input: Sentence: He loved spending time with him when he was younger, but he had moved last year. 
Question: How long did the move take?
Example Output:
Yes.

