- funny you should mention that
ところでどっこい
- now that you mention it: そういえば、そう言われてみるとNow that you mention it, I am getting a little hungry, too. そういえば私もちょっとおなかが減ってきた。I remember, now that you mention it! 今の話で思い出した!Now that you mention it he is acting suspiciously. そういえ
- by when you should be ready: その時までに準備しておけ
- if you should decide to: 万一{まんいち}~すると決めた場合{ばあい}は