そう言えばは英語で？

そういえば、確かに太郎を見かけました。

Come to think of it, I did see Taro.

そう言えば買い物もしたいな。

Come to that, I'd like to do some shopping too.

そう言えばそうだ。

Now that you say it, I think you're right.

そう言えば、子供の頃両親と一緒にここに来たことを覚えている。

Now that you've mentioned it, I remember coming here with my parents when I was a child.

そう言えば、あれから３０年以上も経つのね。

Now that you mention it, it's been more than 30 years since then.

そういえば、前ここで働いていたあの人、どうなったの？

Now that you mention it, what happened to that man who used to work here?