麻烦帮我翻译几个句子,最好能分析一下句子结构.
（1）only by knowing the entire task can you break it down into parts that become manageable for you.
（2）And you meant those words, didn't you?
(3)He causes the death of his wife while coming to her aid.（come to her aid是什么用法?)
(4)He is ever told that his commitment ought to be to finishhis training rather than rescue his friend.(be后面为什么加to)