Ted lent me his dictionary. Rita made us dinner. We sold Patrick our car. In Case I usually bring my dictionary to class in case I forget words. The phrase in case is used to express a reason you do something as a precaution against something you believe might happen.
Speakers use just very often with in case .
I always take my umbrella in case it rains. She wears a sweater in case it gets cold. Notice that the Present Simple is used after in case , and not future expressions. However the Past Tense can be used. I took a coat in case it got cold.