đổi sang thể phủ định nghi vấn
the boys are playing games
=> the boys aren't playing games
=> are the boy playing games?
she eats ice-cream every day
=> she doesn't eat ice-cream everyday
=> does she eat ice-cream everyday?
Mai has some eggs every morning
=> mai hasn't any eggs every morning
=> does mai have any eggs every morning?
they often drink coffee after dinner
=> they don't often drink coffee after dinner
=> do they often drink coffee after dinner?
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