Step outside and you could break a leg slipping on your doormat.请问其中的slipping是什么作用?slipping on your doormat 是什么成分?这是什么句法
问题描述：
Step outside and you could break a leg slipping on your doormat.请问其中的slipping是什么作用?
slipping on your doormat 是什么成分?
这是什么句法
答
1. slipping on your doormat为现在分词短语做条件状语。
2. 即：Step outside and you could break a leg slipping on your doormat.
= Step outside and you could break a leg (if you slipped) on your doormat.
此条件状语从句采用了虚拟语气，只是一种假设的情况。
3. 因为非谓语动词slip和句子主语you之间为主动关系，所以用现在分词slipping.
答
动词短语加ing做状语.
这里大概是条件状语还是原因状语什么的
可以理解成Step outside and you could break a leg if you slip on your doormat.
或者Step outside and you could break a leg because you will slip on your doormat.