Mr.Wang said to us,"Light travels faster than sound."

Mr.Wang said to us,"Light travels faster than sound." My Paul said to us,'Light travels faster than sound.' Mr paul said to us,‘Light travels faster than sound.’大神教我怎么变 My physics teacher said that light travels faster than sound “light travels faster than sound , ”our teacher told us . 改为 I said to my students ：“light travels much faster than sound What is known to us that the light travels faster than sound As is known to us all,light travels much faster than sound. It ( )that light travels faster than sound Light travels faster than sound改为过去式 Light travels much faster than sound. The teacher said “light travels faster than sound.”把直接引语改成间接