You’d better…

You’d better send him to the hospital now.

你最好现在就把他送到医院。

You’d better change your job.

你最好换一份工作。

You’d better not make such a silly mistake again.

你最好不要再犯这种低级错误。

例句：

You’d better not go out because of your bad cold.

你的重感冒还没好，所以你最好不要出去。

You’d better finish your homework before you go to sleep.

你最好在睡觉前把你的作业做好。