you’d better do sht的同义句是什么

常用以下三种：
It is preferable for you to do sth
例：
Although paper application forms are available,it is preferable for you to submit your application online.
虽然纸面申请是可行的,但是最好建议你在网上提交申请.
might do well to do sth
例：
You might do well to start early.
你最好还是早开始.
It is best to do sth
例：
It is best to do it yourself.
最好是自己来做.