216. Before she ever gets the chance to commit to a cause, charity or foundation as First Lady, her most urgent and perhaps most complicated duty may be simply to be herself.
译文在她获得机会作为第一夫人投身于一项事业、慈善工作以及基金会工作之前，她最紧迫或许也是最复杂的任务仅仅是做好她自己。
点睛本句的主干是duty may be to be herself。句首before引导的是时间状语从句；her most urgent and perhaps most complicated皆为duty的定语。本句中动词不定式to be herself充当表语。
commit to sth.在句中意为“投身某事，致力于某事”，此外还含有“交付；忠于……”之意。如：
The baby was committed to the care of his grandma. 这个孩子被交给他的奶奶照顾。
考点归纳不定式充当表语有以下几种情况：
说明主语的具体内容。如：
Her task is to set the table. 她的任务是摆桌子。
My goal is to be a scientist. 我的目标是当科学家。
表示目的等。如：
The wall is to keep people out of the yard. 这堵墙为的是不让人进到院子里来。
