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?

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 batter （not） do sth 造句两句, had batter （not） do sth两句,不要瞎造哦~ had batter 后面加什么 batter had batter后可不可以加 to do i didn't do well in lanuages.i did ---you,so we are half and halfA,not batter than B.no batter then Cno worse whan D.nearly worse than 为什么是not have done和hadn't done ? I ___you not tomore my dictionary ,not i can't find itA.asked B.had asked 我选的是B,是错误的.为什么错?答案A为什么是对的? had better 这里为什么是用had can not得缩略为什么是can't,而is not为什么是isn'tcan not得缩略为什么不是cann't. try not to do sth.为什么是try not 而不是don`t try it is batter to do sth中to能省略吗had batter呢,他的to省略了吗 i didn't know you had called the police before l came here为什么是didn't 而不是don't Tom plays football______,if not batter than,Lester.选项为：A:as well B:as well as C:so well D:so well as So far,we not _____(have)a reply.答案为什么是have not had啊?we 后面能加not吗？ Lucy and Lily don't speak(not speak)Chinese.为什么是don't speak,而不是doesn't speak. Things were not as they had been before为什么是AS as 可以在句中做成分吗