1.It's a very useful book.(用what改为感叹句) 2.This is our teacher's office.(改为一般疑问句) 3.The car hit the tree yesterday.(改为否定句) 4.Mr.Brown said ,"Don't run across the street again,Mary."(改为间接引语)
what a useful book ? Is this your teacher's office? The car didn't hit the treeyesterday. Mr.Brown said to Mary that didn't run across the street again .