Sometimes you will never know the true value of a moment until it becomes a memory.分析下这个句子

题目

Sometimes you will never know the true value of a moment until it becomes a memory.分析下这个句子
Sometimes you will never know the true value of a moment until it becomes a memory.此情可待成追忆,只是当时已惘然.我请帮我分析下这个句子.

答案

sometimes,频度副词作状语.
until it becomes a memory 是由until 引导的时间状语从句.
you 是主句的主语.
will 情态动词表将来.
never频度副词修饰know.
know是主句的谓语.
the true value 是宾语.
of a moment 是value的定语.