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.

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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.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.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）.

Relations bewteen my parents have become difficult.这是现在完成时，表示过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。
.My mom came home from work to find the house clean and tidy.to表示目的，妈妈下班回来是为了确保屋...
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1. Relations bewteen my parents have become difficult.这是现在完成时，表示过去某一时间开始并一直持续到现在并且有可能还会持续的动作或状态。
2. .My mom came home from work to find the house clean and tidy.to表示目的，妈妈下班回来是为了确保屋子干净整洁。
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