Examples of when to use ではありません、ではない、じゃありません、 じゃない


I'm looking for example situations of when to use each level of politeness. I
know they all are the same but when situational wise to use each one is where
I am having confusion.




In terms of situational usage, it partially depends on how one wishes to
present themselves.

That said, the way I've used these forms is as follows:

> ではありません

  * Formal writing, such as a report or documentation

> ではない

  * Formal writings in combination with `ので` when giving an explanation.
  * Formal writings with longer sentences in place of `ではありません` (both between phrases and at the end of the compound sentence).

> じゃありません

  * Formal conversation, such as during an interview. 

> じゃない

  * Casual conversation with friends and / or casual writing such as text messages 

