Difference between - Even though, Even if, Even when & Even so

These expressions are not always interchangeable; the context of the sentence will affect your choice:

"Even though" is used when something is always done or a fact is mentioned.

"Even when" is used when something is occasionally done.

"Even if" is used when something is rarely done or just imagined.

Even So

"Even so" is very much like the word "but" or "however." "Even so" is different in that it is used with surprising or unexpected results.

Examples:

She is loud and unfriendly. Even so, I like her.
She is loud and unfriendly, so it is unexpected that I like her.