Meaning of "in case"

Your expression is much better.

Philip, thanks for your answer. But is the sentence I asked for gramatically correct? Have you ever heard in case used in this way?

Dave W"Don't walk near the river, in case you fall in"

This is not a very good usage of "in case" This would be better:

When you go out in a boat be sure to wear a life preserver, in case you fall into the water.

Thanks. It doesn't make a clear sense to me but, as this sentence comes from an English coursebook and I'm not a native speaker of English, I wanted to make sure that my understanding of in case is right.

Dave WIt doesn't make a clear sense to me but, as this sentence comes from an English coursebook and I'm not a native speaker of English, I wanted to make sure that my understanding of in case is right.

"Don't walk near the river, in case you fall in".

This is fine and quite natural - nothing wrong with it at all.

BillJ

So in case you fall in in this context means so you won't fall in?

Dave WSo in case you fall in in this context means so you won't fall in?

Yes.

BillJ

Thank you very much. The sentence seems to be a bit confusing, though.

Thank you very much for your kind answer.