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: Tocqueville was a classical liberal who advocated parliamentary government, but was skeptical of the extremes of democracy. 
Question: How long  was  an advocate?
[EX A]: No.

[EX Q]: Sentence: If I cannot carry my groceries or my laundry, how can I live?. 
Question: What happened after he did the laundry?
[EX A]: Yes.

[EX Q]: Sentence: The most powerful families thus carved out for themselves whole regions that were to become the fiefdoms of Japanese feudalism. 
Question: How often would one family be able to do something like this?
[EX A]:
Yes.

