сказать да было невозможно, сказать нет было бы невежливо объяснить ему, что это такое, было делом трудным помогать ей - значит делать все самой рассердиться было бы глупо
say yes it was impossible to say no would have been impolite to explain to him what it was, it was a difficult thing to help her - so do all very angry it would be foolish
to say it was impossible to say no to it would be impoliteexplain to him that it was difficultto help her is to do all the workit would be foolish to be angry