situation which explains the reason why someone does something ,you
often use in case or just in caseI’m here just in case anything unusual happens.
2. You do not use future tenses after in case
I’ll stay here in case she arrives (Present Simple) later.
3. In case is not the same as if
in case – “so as to be on the safe side”, refers to the future
You insure things in case they are stolen.
if – refers to a result
You should telephone the police if your things are stolen