A perfect question

[John Dunn]

Replying to Konstantin Goloviznin:

>I'd like to set it more clear.  If I say "I have worked in this company for 2 years" means I still work in this company any way,
but if I don't work there any more it should be "I worked in this company for 2 years".

Yes.

>>From another hand, I remeber an ex. from some manual: "I have lived for in this house 10 years ".  It doesn't obligatory mean  that I still live in the same house.

This is trickier.  To my British ear this sentence as it stands is on the borderline of being acceptable, since the preposition is normally omitted only if something else is present:

I have lived in this house ten years now.
Ten years I have lived in this house and never once have I spoken to my next-door neighbour. 
In both sentences 'have been living' is also possible and perhaps more likely; both sentences mean that you are still living in the house.   Someone may correct me, but I cannot think of an English sentence with a perfect tense and a specified duration that does not necessarily mean that the action os still continuing.

Legally you need a minimum of three people in order to stage a riot.

John Dunn. 
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