请教这句Could you tell me what time is it now?为什么要用could 不用can 现在问世间为什么是过去式

请教这句Could you tell me what time is it now?为什么要用could 不用can 现在问世间为什么是过去式 could you tell me who is our teacher?这句为什么不倒装? Could you tell me who is your teacher?这句是什么从句啊? Could you please tell me what day it is today这句话是什么句形? 这句英语对吗?如下could you tell me what is the meaning of the word me,could,your,you,please,name,tell.连词成句 the way tell could me you please 连词成句 her,could,please,name,us,tell,you ,连词成句 Could you tell me some interesting things?变为同义句 coule you tell me_______ _______? 同义句转换：Could you tell me the way to Sunshine Park?Could you t could you tell me the way to the museum?改写同义句could you tell me____ _____the museum ______? Could you tell me what I should do (改为同义句)Could you tell me _____ _____ _____?谢 Could you tell me how to get to the Bund,please?同义句转换Could you tell me Could you tell us what we should do next?同义句转换Could you tell us______ _________ next? Could you tell me where the toilet is 同义句Could you tell me where ____ ____ the toilet Could you tell me the way to school?同义句Could you tell me __ I can __ __ school? Could you tell me how I can get there?(同义句)Could you tell me how__ __ there? could you tell me where i Can buy a scarf 改为同义句 could you tell me ( )( )buy a scarf