Americans work a lot harder than you do.句子最后为什么有个do?

Americans work a lot harder than you do.句子最后为什么有个do? Do you have a lot of work to do today?这句话错在哪里,有个改错题 Do you have a lot of work to do today?这句话有什么错误么 work harder than before,because i'm doing ___ i want to do.A 这句话有没有问题!I work harder than he do. I know him better than you do.这句话中为什么最后加了个do 英语改写句子题You will do better in your lessons if you work harder If you work harder ,you ’ll do better in English More and more Americans go to work on bikes.Do you know()?A. what work you do和what work do you do哪个句子正确?为什么? i have a lot of work to do to do是句子里的什么成分 DO you have to do a lot of traveling in your work?这里的 have t