do you know how he went across the river 这个句子有语法错误码主句和从句的时态都不一致可以吗

how do you know How do you know? Then how do you know he is happy?急用! How do I know you? How does he go to school ?Do you know?合并为一句 Do you know ____ _____ to school? ----- will he be back home ,do you know?A How long B How often C How soon D How far 为什么是Do you know how old he is而不是he is? Do you know how often he ____（锻炼）?He is so strong.exercise用加单三吗 do you know ___(he)? 为什么要用do you know how he gets to school,不用 do you know how does he get to school. do you know what does he do 和do you know how does he like.这两句话错了么?错哪了? 英语翻译Do you know how long he —— —— ——? How _____(sadly) he looks.Do you know what happened to him? Then how do you know he is happy（翻译中文） Ten how do you know he is happy?翻译过来是什么 Ten how do you know he is happy?翻译过来是什么 do you know how much i love how much do you know really about