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sing; to play to sings; play sing; play singing; play
A. sings; sings sing; sing sang; sings sings; sang
is singing; is singing is singing; sings sings; sings sings; is singing
heard to sing, may was heard sing, must heard sing, must was heard to sing, may
sing to sing sings singing
sing; singing sings; sing sing; sings singing; sing
sing to sing singing sings
Is；sings Does；sings Is；sing Does；sing
What can he do Does he like music Can he come here this afternoon Where does he sing and dance
sing to sing singing sings
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