“俗话说的好。。。”英语怎么说

俗话说的好... As the proverb goes/As the saying goes/If a leader sets a bad example

If a leader sets a bad example, it will be followed by his subordinates.
俗话说：上梁不正下梁歪。
As the proverb goes, time is money.
俗话说，时间就是金钱。
As the saying goes, "Do in Rome as the Romans do".
俗话说。“入乡随俗”。
As the proverb says: Nothing in the world is too hard to do if we set our minds on it.
俗话说：世上无难事，只怕有心人。

Just as the old saying says...俗话说的好。。。

As the saying goes

There goes the folksay that...

As the saying goes 俗话说的好 / 正如俗语所说

参考：
http://www.baidu.com/baidu?wd=As+the+saying+goes&tn=monline_dg