很高兴能够在这里回答你的问题：
You'd better stay at home and have a good rest,_hadn't you__?
you'd better= you had better
其中had 为助动词词
前肯定,后用否定,所以是had you
你最好待在家好好休息一下,好不好?应该是You would better吧不是you would better,是you had better 你最好