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May be this is reasonable advice, Chaika, but if you look in Murphy`s grammar (it is not the worstest book) you won`t find the answer. So thank you, Chaika but I don`t think it was worth advising me...

OK. But what about a case when such expression is included in monologue? When speaker do not argue with anybody? What does it mean in that case?

Could anybody explain me a difference between following expressions:
I worked hard and I did work hard (or Present Simple: I work hard OR I do work hard)