亀井さん
サンフランシスコから羽田空港まで行きましたか。今ならきっと成田空港ですね。

Are you familiar with そうです”it is so” or “that’s right”?
そうなんですね is kind of a variation of this phrase.
そう　＝ “so” / な　んです = when you add “-n desu” to a na-adjective, noun or etc., “na” is added before it /　ね= tag question

And for ” I went to …”. You’re right. It should be 行きました (ikimashita).
Thanks for pointing out.

last question - I promise !!!!!!

In the previous entry I notice Ivonne asked translation of

>>How do you say”I WENT to the store”, in japanese?
answer given was

“Watashi wa depaato (or o-mise) ni ikimasu.”

But what about
行きました　rather than 行きます

私わデパアトに行きました

ありがとうございました

In this lesson - I hear you say …..

「そうなんですね」

I can guess from context - however what is the exact meaning

ありがとうございます：）

>>How do you say”I went to the store”, in japanese?
“Watashi wa depaato (or o-mise) ni ikimasu.”
The place you’re going has to be marked by particle “ni” or “e”.

I hope this helps.