New English

How do the idioms we use change how we feel about things?  How does the way we say something change its meaning?  In England it is not uncommon to be greeted with, "You alright?" and one answers, "Yeah good."  When someone thanks another for a task, the corresponding response is, "That's alright."  Everything is said in a quick friendly manner.  The voice is used in a soft, brisk, and unforced manner.  How does it change the language that I speak and hear?  Laying meaning on a newly landscape of expression.