but they will die if two or three days without water这儿if作什么用?

问题描述:

but they will die if two or three days without water这儿if作什么用?

条件状语从句 如果两到3天没进水的话他们就会死 if 后时间短语+介词+名词 if后面的就是一个完整的句子了了 if two or three days without water