为什么是had better do而不是have呢?

为什么是had better do而不是have呢? 谁能教下我英语,1.hardly,happily,为什么要加ly?在什么情况下要用?2.had better do sth,为什么是had而不是have,同样的,be made up of,为什么是made而是不make had better 这里为什么是用had had he been here yesterday,he would attend.为什么是had了,后面是would do而不是would have done 为什么是had batter not to do?肯定句是had better do sth啊,为什么否定句就变成to do了呢? had better do=? which do you like better,swimming or fishing?为什么是better而不是more，谁能在语法的角度给讲解一下？ I've had my radio repaired so soon because my father had me do it为什么是my father had me do it ,而不是用done,不是had done 是had better to do还是had better do had better do还是had better to do had better +do sth 还是had better +to do sth had better(not) do sth... had better do等于什么 哪些词是像have better not do sth..而不是do not do sth?除了let makie let ask 还有哪些?不好意思 had better... you'd better 是什么句型是什么句型better是副词吗?它修饰had吗?为什么是had?为什么不是have能用将来时吗you will have better to do可以用第三人称吗he has better to do to为什么可以省略 我知道 只有 let help I had better ___(do/to do) You had better go to see a doctor right now为什么是had不是have? though he had tried to climb to the top of moutain several tmes,he did not ________为什么是make it 而不是 do it