up is down,white is black. 三十年河东，三十半河西。

A friend in need is a friend indeed患难见真情

It`s no use crying over spilt milk覆水难收

Love me,love my dog爱屋及乌

Where there is a will,there is a way有志者事竟成

心有餘而力不足 the spirit is willing but the flesh is weak

I remember some 成语 about friend.

有福同享，有难同当yǒu fú tóng xiǎng yǒu nàn tóng dāng---means good friends share happiness and hardship, I don't know if there is proverb in English of the same meaning.

远亲不如近邻yuǎn qīn bù rú jìn lín----A close neighbor means more than a distant relative. Is this a proverb? I saw it in the news about relationship between China and Pakistan.

患难见真情huàn nàn jiàn zhēn qíng----a friend in need is a friend in deed.

在家靠父母，出门靠朋友zài jiā kào fù mǔ chū mén kào péng you,  means rely on parents at home and on friends outside. This is a philosophy of chinese. If there is an English proverbs, please tell me.