(1) 你是不是瘋了?

Have you lost your mind? 或 Are you out of your mind?

(2) bear in mind that... 記住...

Bear in mind that your mon is coming tomorrow.

(3) slip my mind 忘了

Crap! That totally slipped my mind.

(4) cross my mind 想起，記起

That plan never crossed my mind.

(5) Out of sight, out of mind. 眼不見心不煩。

(6) Great minds think alike. 英雄所見略同。

(7) Mind your own business. 別多管閑事兒。

(8) Never mind. 沒事。