As already suggested by FuNe, there are some books which can help (like the one he proposed, or maybe "Getting to Yes", which I have not yet read, though). Out

As already suggested by FuNe, there are some books which can help (like the one he proposed, or maybe "Getting to Yes", which I have not yet read, though). Out of curiosity, how many times do you use these words: no, don't, always, most of the time, 99% of the time, absolutely, they, sigh, boring.