help me please

[s@r@h11]

hello every body

please i need help in sociolinguistics who can help to analyse in essay this quotation of david crystal
"sociolinguistics studies the ways in which a l anguage interacts with society . it is the study of the way in whichl anguage's structure changes in responce to its different social functions and the definitions of what there function are"
and i need more information about the linguist edward sapir and his framwork
thanks