instruction:
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.
question:
Sentence: The most powerful families thus carved out for themselves whole regions that were to become the fiefdoms of Japanese feudalism.
Question: Were the families still powerful 100 years later?
answer:
Yes.

question:
Sentence: So from now on, Marsha takes extra special care to make sure Joey is safe and sound at all times.
Question: Is Joey safe and sound today?
answer:
Yes.

question:
Sentence: In the aftermath of Massaga and Ora, numerous Assakenians fled to the fortress of Aornos.
Question: Was the fortress built before the aftermath of Massaga and Ora?
answer:
Yes.