had/would better和may/might as we

may/might as well do sth.不妨……,最好……
might as well 比may as well 更婉转些.

had better是一固定词组，had better“最好”，用于表示对别人的劝告、建议或表示一种愿望。 would better+[动词原形]与 had better+动词原形，都表示“最好。前者语气上更加委婉一下

用Had Better时,说话者多少会有身份上的优势,或是家长,或是老师,或是上级. 而 might as well相对使用时就没有上面类似的情况.有个外国朋友告诉我had better只有上级对下级时才这样说，might as well就没有这方面的界限.