Dad has come from work already.
Mother is cooking in the kitchen at the moment.
Peter the First was building St Petersburg for many years.
We have been studying English for many years now.
Yuri Gagarin flew to space many years ago.
Как я понял имеется ввиду Tag endings
Sometimes father helps me with my homework, isn`t he?
They aren`t having dinner at present, are they?
They have been bulding this house for a few months, haven`t they?
They have translated 2 texts this morning, haven`t they?
They` ll be building the system for years, won`t they?