1.He really felt conscientiously vexed on the occasion; for the very exertion to which he had limited the performance of his promise to his father was by this arrangement rendered impracticable.

【难句解析】第二句的主干是for the exertion was impracticable；

【句子翻译】此时，他良心上的确感到不安，他已经把履行对父亲的诺言局限在帮帮忙这一点上，想不到这样一来，连这点忙也帮不上了。