そうですか versus そうなんですか


When do I have to use

> そうですか。

and

> そうなんですか。

?




When you have to use? Well, any time you want to, as long as you mean "is it?"
or "is that so?" ;-)

So much for kidding.

Do you want to differentiate between the two? They mean the same thing, with
the latter revealing a bit of surprise/scepticism/unexpectedness etc,
depending on the context.




When you have to use? Well, any time you want to, as long as you mean "is it?"
or "is that so?" ;-)

So much for kidding.

Do you want to differentiate between the two? They mean the same thing, with
the latter revealing a bit of surprise/scepticism/unexpectedness etc,
depending on the context.

