1.Relations bewteen my parents have become difficult.问--为什么要

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1.Relations bewteen my parents have become difficult.问--为什么要加have.
2.My mom came home from work to find the house clean and tidy问--为什么要加to.
真诚请求大家耐心解答.八下课本疑点.

1·这表示此种情况已经有一段时间了
2·to不仅可以表示目的,也可以表示结果,表明came发生在find之前.如果不加to,就只能用and,意思没有那么明确了.而且to表示结果,略带一点感情色彩（这里是吃惊、惊喜）.
再问：请问，不能不加and，也不加to吗？
再答：可以动大手术，改成两个句子…… 比较简单的改动似乎没有

1.Relations bewteen my parents have become difficult.问--为什么要 relations bewteen my parents have become difficult. Relations between （we）have become friendly have difficulty talking with your parents.为什么用have?difficult 为什么become前加have?（Cycling has become my favourite.）这是什么用法? 1.It has become more difficult to see my old friends.对现在的影响是英语翻译Some parents agree that honor societies have become too Some parents have become () that learning to play chess help my parents have 20 balls. 为什么是have become 而不是have became? I heart from your parents that you have something difficult you have become my addiction什么意思