Could you tell me when did it happen

Could you tell me when did it happen -Could you tell me when ----? 说明理由1.Could you tell me ___________________?A.when did he le When did they have a meeting?Could you tell me 合并成一句 Could you tell me when _____? Could you tell me when (start) tomrrow Is it beautiful?could you tell me?Why did you say that?I wan Could you tell me if it _____tomorrow? could you tell me what you did yesterday evening? Could you tell me when is you birthday? could you tell me when you came to china? Could you tell me the way to the zoo?Follow me,I happen ____