Traditional Culture Encyclopedia - Weather forecast - The weather forecast says it will be a dry day. Why do you use it for something?

The weather forecast says it will be a dry day. Why do you use it for something?

The weather forecast says it will be a dry day.

The weather forecast says the weather is bad.

The for here is the purpose of the table, which is one of its uses, for example:

I have sent my coat to be cleaned. I sent my coat to be washed.