So it is asking you to take a look at how you talk on a normal day. Do you treat your friends the same way you treat your parents?
Then it is asking for you to write at least 250 words describing the language you use, and what that means.
For example:
You are talking to your teacher, "May I please use the bathroom?" Normally you don't have to ask, but when you are at school it is different.
Another example:
You are talking to your best friend, "Sup' dude." You normally talk like this with friends. But you wouldn't with teachers.
Hope that helps :)