had better do中的had是不是表示过去式

是had better to do还是had better do had better do中的had是不是表示过去式 had better do=? 是had better do sth还是have better do sth 最好不做某事是had better not do sth 还是had better not to do sth had better do还是had better to do had better +do sth 还是had better +to do sth you'd better do something 中的d是不是had? you'd better do something 中的d是不是had? had better(not) do sth... had better do等于什么 You had better do sth中的had是什么词性?请专业人士回答哦！ I had better ___(do/to do) had better not do sth Is it right?我问的是语法是否正确：had better not do sth • 最好不做某事是had better not do sth 还是had better not to do sth?... had better not do?had not better do?为什么我们高三复习那本单词书上写的是had not better do?不是应该是had better not you'd better not .中的('d)是什么的缩写是had吗?为什么这里用had? have better do sth.和had better do sth.