This is the place to post questions and discussions on usage and style. The members of the Wordwizard Clubhouse will also often be able to help you to formulate that difficult letter.
Are these correct:
1) I didn't take the umbrella in case it rained. I took it to protect myself against the sun.
2) I'm not taking the umbrella in case it rains. I'm taking it to protect myself against the sun.
They seem okay to me.
Signature: Phil White
Non sum felix lepus