How we cite our quotes: Citations follow this format: (Chapter.Paragraph)
Quote #4
She reflected on the affair for some time in much perplexity, and was more than once on the point of requesting from Mr. Thorpe a clearer insight into his real opinion on the subject; but she checked herself, because it appeared to her that he did not excel in giving those clearer insights, in making those things plain which he had before made ambiguous. (9.31)
Unclear communication stem from two places here. On the one hand, Catherine herself is perplexed and can't interpret what John is saying, or not saying. On the other hand, John is not expressing himself clearly. Learning how to be a good translator is a key aspect of Catherine's development here.
Quote #5
"I am glad of it, for we shall all be there." - This civility was duly returned; and they parted - on Miss Tilney's side with some knowledge of her new acquaintance's feelings, and on Catherine's, without the smallest consciousness of having explained them. (10.20)
Catherine is once again unconsciously communicating her sentiments to someone else, in this case the perceptive Eleanor Tilney. Catherine had been attempting to question her about Henry, but subtlety is definitely not Catherine's strong suit.
Quote #6
The three others still continued together, walking in a most uncomfortable manner to poor Catherine; sometimes not a word was said, sometimes she was again attacked with supplications or reproaches, and her arm was still linked within Isabella's, though their hearts were at war. At one moment she was softened, at another irritated; always distressed, but always steady. (13.8)
Catherine faces up to some intense peer pressure, where the Thorpes and James alternate between an array of persuasive tactics: flattering her, sweet-talking her, attacking her. This war of wills is fought with language, and Catherine is essentially under siege.