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They are women.
A: What is the woman doing?
B: She is singing.
A: What are the women doing?
B: They are dancing.
baby
This is a baby.
They are babies.
A: What is the baby doing?
B: The baby is crying.
A: What are the babies doing?
B: They are sleeping.
cry---
crying
jump---
jumping
sing---
singing
walk---
walking
talk---
talking
sleep---
sleeping
run---
running
sit---
sitting
have---
having