do as you would be done by.

己所不欲，勿施于人。

doing is better than saying.

與其掛在嘴上，不如落實在行動上。

do it now.

機不可失，時不再來。

do nothing by halves.

凡事不可半途而廢。

don't claim to know what you don't know.

不要不懂裝懂。

don't have too many irons in the fire.

不要攬事過多。

don't make a mountain out of a molehill.

不要小題大做。

don't put off till tomorrow what should be done today.

今日事，今日畢。

don't put the cart before the horse.

不要本末倒置。

don't trouble trouble until trouble troubles you.

不要自找麻煩。

don't try to teach your grandmother to suck eggs.

不要班門弄斧。

do well and have well.

善有善報。

each bird love to hear himself sing.

孤芳自賞。

early to bed and early to rise makes a man healthy, wealthy and wise.

早睡早起身體好。

confidence in yourself is the first step on the road to success.

自信是走向成功的一步。

constant dripping wears away a stone.

水滴石穿，繩鋸木斷。

content is better than riches.

知足者常樂。

count one's chickens before they are hatched.

蛋未孵先數雛。

courtesy on one side only lasts not long.

來而不往非禮也。

creep before you walk.

循序漸進。

cry for the moon.

海底撈月。

custom is a second nature.

習慣是后天養成的。

custom makes all things easy.

有個好習慣，事事皆不難。

diamond cuts diamond.

強中自有強中手。

do as the romans do.

入鄉隨俗。