You would better+动词原形。例句：You would better not believe all what he said, he is one who will not be flush when telling a lue.
双语例句
1、You would better square the material.
你最好把料裁成方形的。
2、When he gets mad, you would better let him alone.
他发病时，你最好别管他。
3、Tax official: at first, you would better make clear that in what form the equity arise?
税务局：这要看所转让的股权是怎么形成的。
4、There's something wrong with the swipe machine, so you would better pay with cash.
刷卡机出了点问题，您最好付现金。
5、So you would better gather jade in autumn, you would go to Kashgar jade-river to seek jade when the cream of the moon is full.
所以采玉，最好要在秋天，月华最为饱满的时候在河里去寻找玉石。