Do you know when he left?这里为什么用left

Do you know when he left?这里为什么用left do you know the time when he left do you know the time when he live?要今天哦, Do you know when he----?When he -----,please call me.用arrive的适当形式填空 Do you know when (meet) you certainly do not know ,I think you when he came to tear .you certainly do not know ,I think you when he came to tear 谁知道. do you know when the meeting begin?BLANK he comes backA if B when C until when was he born,do you know?回答为什么不是yes/no开头?do you know能不能放前面 do you know ___(he)? When do you know?后面填 he will come 还是will he come When you love someone but she or he don't know what should you do? Do you know when he comes?与When he will come.哪个正确,用法上有什么区别? 把句子合并成宾语从句When did he leave here?Do you know? when did he leave here do you know?合并成宾语从句怎么改 when did he move to another city ?do you know?（合并为一句 Do you know anything about him/her when he/she wsa young you,know,was,when,basketball,invented,do Do you know _____?(怎么填)-Do you know _____?-He wallks.A.how does he get to schoolB.how he gets to schoolC.When does he get to schoolD.When he gets to school说明原因! ·改为含宾语从句的复合句When did he go?Do you know?I do not know.Where is he from?