Greys will only talk if they want to! Yes you can sit and talk all day to them but they tend to pick everyday words up in general if they are in the family room.
That is funny about Pascal, my eldest grey Charlie has started to do the phone ringing as well, as soon as I pick up the phone he shouts "hello", I think this shows how intelligent they are as well.
Some greys never talk, others are closet talkers and others will only say a few words.They are all different and learn things at different stages.