题目内容：

用英语写的校规,急用!
要求:3句肯定,3句否定,其中几句用上 have to ,showldn't ,mustn't .

优质解答

We have to wear uniforms in the school.We shouldn't run in the classroom.We mustn't sleep in the class.We should speak English on the English class.We should switch off the lights before we leave the ...