He isn't a student,_____ a teacher用not but ?

He isn't a student,_____ a teacher用not but ? He is a student,isn't he?He is a student,is not he?哪一个正确 三道英语填空,1.She isn't a teacher,but a doctor _____.2.He's writt Isn't he a student?朗读音调 Is he a student?No,he isn't.(能不能用No,he's not?） I'm not a teacher.He isn't a teacher,________ Tom isn't a student,______ an English teacher Tom isn't a good student .He ---(not do) his homework every --Isn't he a worker?--_________,He is a teacher. Is he a student?No,he isn't.(不能用No,he's not.) 为什么 You are 在句 Isn't he a Isn't he a student?这句话是不是反义疑问句?如何回答? He isn't a teacher .She isn't a teacher.(合并为一句)