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.

[EX Q]: Sentence: In particular, the author differentiates between what he terms 'dominance' and a particular version of 'colonization'. 
Question: What happened after the author wrote this?
[EX A]: No.

[EX Q]: Sentence: They then took a boat to Africa and Asia, where they went on a trip through the mountains. 
Question: How long was their trip through the mountains?
[EX A]: Yes.

[EX Q]: Sentence: The two become close friends but do not reveal the secrets . 
Question: How long did it take them to become friends?
[EX A]:
Yes.

