为什么可以用earlier than usual 而不能用earlier than usually

为什么可以用earlier than usual 而不能用earlier than usually get up earlier than usual 为什么than 后要用形容词 today,tom goes to school earlier than usual 为什么用usual不用usually 关于英语比较级问题1.Of all the boys he reads most distinctly.(为什么不用the most)2.She goes to work earlier than the others.(可以用最高级表示吗 the earlist than...) in their earlier twenties 中为什么用earlier ?如何翻译? 英语翻译为什么不用early，而用earlier earlier better than later or more early ...than是否等于earlier...than? rather后加比较级rather后面可以直接加比较级吗?如：...rather earlier than usual... those teachers often get to the office as early as seven o clock为什么用as early as 不用earlier than go to bed earlier than （usual）还是（usually） 为什么 his last ocean journey was more than half a century earlier than Columbus' first journey to America这句话为什么要有“more than”“his last ocean journey was half a century earlier than Columbus' first journey to America”这样对吗？ He came earlier than ( he was ) expected. That returned earlier than we(expect)_________ Today Tom goes to school earlier than ___.A:as usual B:usual C:usually D:ago 选什么 为什么 if they had starded earlier than expect,they would be here nowwould be 为什么不能换成would have been It the first time I have got up earlier than my parents.这里的从句为什么用完成时? he returned home earlier than--(usual) for it was not a ordinary day.填ususlly还是usual为什么?