is老师，请问这句话什么意思？我还有好多问题请教您，谢谢！！！知道天气会怎样在你（们）策划一个特别事件时有帮助句子成分分析：Knowing what the weather ___going to be 动名词短语做主语，其中what the weather ___going to be是knowing的宾语从句 is 系动词useful表语when you are planning a special event.时间状语从句