原句错了,应该是：Mr.Green teaches us English.
否定句：Mr.Green doesn't teach us English.
请指出,希望能和你一起探讨~
如果认为我的回答好的话,请及时采纳,谢谢。我再问你一下。We clean the classroom on Friday afternoon。（改为一般疑问句）He isn`t a businessman.（改为肯定句）Do you clean the classroom on Friday afternoon?He is a businessman. （商人）