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All the birds are not flying south. Are all the birds fluing south?
They are not travelling ...Are they travelling..?
Helen is not taking ...Is Helen taking ..?
Mr Evans is not writing.. Is mr Evans writing?
Ann is not doing.. Is Ann doing..?

Whera are all the birds flying?
What are they doing at present?
What is Helen taking at country club?
What kind of articles is mr Evans writing?
How is Ann doing in her studies?