（I am reading an English book.）(The boy is drawing pictures.

I often read an English book.The boy often draws pictures.He doesn't cleanthe blackboard.They often have a music class.  祝你学习进步!
再问： 额，是3句话。The boy is drawing pictures.He isn't cleaning the blackboard)是一句话.......
再答： The boy is drawing pictures.He isn't cleaning the blackboard 改为： The boy often draws pictures ,he doesn't often clean the blackboard.