I wish I could anticipate when it's going to rain.句中的when 意思,起什么作用?

问题描述:

I wish I could anticipate when it's going to rain.句中的when 意思,起什么作用?

I wish I could anticipate when it's going to rain.
我希望我能预料到什么时候会下雨.
When 可以理解为 什么时候
在句子里作时间状语