2

When do I have to use

そうですか。

and

そうなんですか。

?

Friendly Ghost
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    This is actually a super-advanced question despite the way you make it look like. Each phrase has multiple different nuances depending on how it is said with regards to intonation, stress, etc. –  Jul 12 '15 at 07:59

1 Answers1

2

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.

eltonjohn
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