Question

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His friends are very busy now
Robert have a nice living-room in his flat 
my sister is an accountant on our firm
We have two lectures and two seminars evry day
she have a nice puppy

Answer 1

Are his friends very busy now?
Does Robert have a nice living-room in his flat?
Is my sister an accountant in our firm?
Do we have two lectures and two seminars every day?
Does she have a nice puppy?