Between friends all is common.
朋友之间不分彼此

　　Better an open enemy than a false friend.
明枪易躲，暗箭难防。
 
Admonish your friends in private, praise them in public.
在私底下要忠告你的朋友，在公开场合又表扬你的朋友。

　　A friend is best found in adversity.
患难见真友。
 
A friend is a second self.
朋友是另一个我。
 
A friend in court is better than a penny in purse.
囊中有钱，不如朝中有友。
 
A faithful friend is hard to find.
益友难得。
 
A bosom friend afar brings distant land near.
海内存知己，天涯若比邻。

　　Without a friend the world is a wilderness.
没有朋友，世界就等於一片荒野。
 
When a friend asks, there is no tomorrow.
朋友的要求不要拖。
 
We can live without our friends, but not without our neighbours.
生活可无友，邻居不能无。
 
We can live without a brother, but not without a friend.
我们生活中可以没有兄弟，但不能没有朋友。
 
Trust not the praise of a friend, nor the contempt of an enemy.
不要信赖朋友的赞扬，也不要仇敌的轻蔑放在心上。
 
To preserve a friend three things are required: to honour him present, praise him absent, and assist him in his necessities.
维持友谊需要三点∶当面尊重他，背后赞扬他，需要时帮助他。
 
Everything is good when new, but friend when old.
东西新的好，朋友老的好。
 
Books, like friends, should be few and well chosen.
书籍如朋友，应该少而精。
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A friend to everybody is a friend to nobody.
广交友，无深交。
 
A friend is not so soon gotten as lost.
交友慢，失友快。
 
A friend is never known till a man has need.
不到患难时，永远不能认识真正的朋友。