为什么不能说he will leave after an hour?要用in an hour?

为什么不能说he will leave after an hour?要用in an hour? he said he would leave tomorrow.这样算是直接引述句吗?为什么后面的话还要用过去式?would.为什么不讲成he said he will leave tomorrow.我们说中文有时候也会说这样的话，但是新概念上面的为什么转述的 What he says ____(mean)he will leave here.空格中为什么填means 为什么不能说He is an English 为什么不能说he is an english? 9. ____ he will leave for Beijing. A. It will not long before B. It is before long that C. It is before long D. It was before long that答案是D选项.为什么不能选B选项 l think he will be back soon.为什么不能写成 l think he will back soon . He said he would leave tomorrow.为什么leave不用过去式 any students caught will have to leave the classroomany students caught cheating will have to leave the classroom说作弊为什么用catch?为什么加上ing What he says _____(意思是)he will leave here. 为什么只能说will be more pollution而不能说will have more pollution will sam leave for Madrid next month.he will leave for moscow.　　怎么翻译? It is necessary that he __________for Beijing right now.A.leave B.leaves C.will leave D.left选什么?为什么? in a day or two与in one day or two的区别?He will be back in a day or two为什么不能说He will be back in one day or two? He wants to know if it_____(be)a fine day tomorrow.答案上说应该填(will be),为什么不能填（is)呢?不是主将从现吗? when did he leave?when did he leave?这里为什么不用leaves而用leave呢, He will go back to his parents,because he left home for too long这句话中leave为什么用过去时?为什么不用一般现在时呢? I will leave here tomorrow ,he said.改为间接引语