A.
Study this example situation:
Dennis
stopped smoking two years ago. He doesn't smoke any more.
But he
used to smoke.
He used
to smoke 40 cigarettes a day.
'He used
to smoke' = he smoked regularly for some time in the past, but he doesn't smoke
now. He was a smoker, but now he isn't
B.
'Something used...
Used to (do)
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