老人に席を譲るとは彼も礼儀をわきまえている。
It was civil of him to offer his seat to the old man.

彼は謝るという礼儀さえもわきまえていなかった。
He did not even have the grace to apologize.

身分をわきまえなさい。
Remember your station in life.

出処進退の潔さをわきまえている、と彼は言っているけれど、いざとなったらどうだかね。
He always talks as though he knows how to handle himself but you never know how he'll act when the chips are down.

自分の立場をわきまえなさい。
Know your place.

人の夢に出てくる時は、立場をわきまえてよ。
If you're going to come into my dreams, at least know your place.