skate-skates-skating
buy-buys-buying
wash-washes-washing
have-has-having
do-does-doing
study-studys-studying
watch-watches-watching
swim-swims-swimming
run-runs-running
eat-eats-eating
skates-skating buys-buying washes-washing has-having does-doing studies-studying
watches-watching swims-swimming runs-running eats-eatting
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