1.To be tied down to the regular payment of such a sum, on every rent day, is by no means desirable: it takes away one's independence.

【难句解析】be tied down to的意思是“被...束缚”；by no means意思是“决不”；

【句子翻译】一到年金支付日，都要照例支出一笔钱，这着实有些讨厌：它剥夺了一个人的自主权。

2.If I were you, whatever I did should be done at my own discretion entirely.

【难句解析】at one's discretion的意思是“自行处理”；

【句子翻译】我要是你呀，不管做什么事，一定自作裁夺。

3.whatever I may give them occasionally will be of far greater assistance than a yearly allowance, because they would only enlarge their style of living if they felt sure of a larger income, and would not be sixpence the richer for it at the end of the year.

【难句解析】第一句的主语是whatever I may give them occasionally；

【句子翻译】偶尔给她们几个钱，比给年金有益得多，因为钱给多了，她们只会变得大手大脚，到了年底．一个小钱也多不出来。

4.my dear Mr. Dashwood, how excessively comfortable your mother-in-law and her daughters may live on the interest of seven thousand pounds, besides the thousand pounds belonging to each of the girls, which brings them in fifty pounds a year a-piece.

【难句解析】how excessively...thousand pounds是感叹句；besides...the girls是状语，修饰live；which引导的定语从句指代the thousand pounds；

【句子翻译】你只要想一想，你继母和她的女儿们靠着那七千镑得来的利息，会过上多么舒适的日子啊。况且每个女儿还有一千镑，每年能给每人带来五十镑的收益。