Question: When is mother day celebrated in the united states?
qaPairs: question: When is mother's day traditionally celebrated in the United States?
answer: second Sunday in May
question: When was mother's day celebrated in the United States in 2017?
answer: May 14
question: When was mother's day celebrated in the United States in 2016?
answer: May 8
question: When was mother's day celebrated in the United States in 2015?
answer: May 10