翻译“既然这样，那随便你！”

If so , do as you wish!

As long as it is like this, then I will leave it to you./
As long as this is the case, it's up to you.
o0街头霸王0o 那你老师教错你了,还错得很呢!

Since, that is like this casual you

绝对没错,刚学的

"既然这样，那随便你！”
If that so, do whatever you want!
If that is the case, do it then.( It means I don't really care.)

If so,suit yourself.
Now that is the case,you may do so and welcome.

well, it is up to you.