I must go to sleep now.(用had better改写）

I must go to sleep now.(用had better改写） it is too late now,i must go to sleep You'd better go to sleep now.（否定句） we had better go back to the station now 为什么要用 go back to 谁能帮我翻译这句话,now i must go to sleep but i hope we can chat soon i have to sleep now 跟 i have to go to sleep now的区别 i must go to school now. I must to go now.翻译 You had better go to see a doctor right now We had better go back to the station now, 这里为什么用to must i go now? I must go now.It's late.为什么用must而不用have to?