How does Emily Bronte's use of language and structure make chapter 9 interesting to the reader?
Central to this Chapter is Catherine's description of her love for Heathcliffe in comparison with her love for Edgar Linton. She also justifies her reason for accepting Edgar Linton's proposal and states her declaration that she will have both men in her life.
Catherine's statement "It would degrade me to marry Heathcliffe" (obviously a use of dramatic irony as we and Nelly Dean know that Heathcliffe can hear Catherine) presents Catherine as a victim of sociological forces beyond her control. In her society, she must make a good match, and clearly Heathcliffe would not be a good match as he is of questionable parentage and is not a "gentleman" in the same way that Linton is.
However, in the same Chapter, Catherine explains her love for Heathcliffe, saying "he's more myself than I am" and "I AM Heathcliffe!" Such strong statements reflect the bond that the two share, however Catherine's decision to have both men in her life reflect a selfishness to have what she wants that will result in pain for all three of them. She also shows her naivety by thinking that her social marriage with Linton could not possibly affect the spiritual bond she shares with Heathcliffe.