He is writing / has been writing books for 10 years.
She always helps / has been helping her mother about the house.
He is already writing / has already written 10 books.
Is he playing / Has he played chess at the moment?
Sarah looks / has been looking / is looking for a new flat at the moment.
He play / has played / plays tennis every day.
She has done / is doing / has been doing her homework for 2 hours.
Spring always follows / is following / has been following winter.
Jane has been working / has been worked / have been working at the library for ten years.