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.
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Question: Sentence: He tried to halt the Dayaks' piracy and head-hunting while defending their more ""morally acceptable"" customs. 
Question: How often does he defend their acceptable customs?

Answer: Yes.


Question: Sentence: In London at mid-afternoon yesterday, Ratners's shares were up 2 pence (1.26 cents), at 260 pence ($1.64). 
Question: How long did Ratners's shares stay up?

Answer: Yes.


Question: Sentence: With large population movements in the 1990s to urban areas, the provision of education has undergone transformation as well. 
Question: What time did most education in these areas regularly start?

Answer:
No.


