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。

if you would be loved, love and be lovable.
想被人爱，就要去爱别人，并让自己可爱

In prosperity our friends know us; in adversity we know our friends.

在顺境中，朋友结识了我们；在逆境中，我们了解了朋友

It is impossible to love and to be wise.

爱令智昏。

Long together share sb.’s joys and sorrows together, in order to have friends with complete mutual understanding

长期在一起同甘共苦共患难，才能有莫逆之交。 

A father is a treasure, a brother is a comfort, but a friend is both

父亲是财富，兄弟是安慰，朋友兼而有之。

A friend exaggerates a man's virtue, an enemy his crimes

朋友宣扬人的美德，敌人夸大人的罪过。