1、肯定句改否定句的方法 ：
1.在be动词后加not
如：is not, are not,am not
2.在can，should， will等后加not
如：cannot, should not,will not；
3.上述都没有的，在动词前加助动词否定形式don't/doesn't/didn't
4、 some 改成any
如：I am a girl. → I am not a girl.
You are a student. →You are not a student.
→You aren’t a student.
This is Tom’s bag, → This is not Tom’s bag.→ This isn’t Tom’s bag.
1.在be动词后加not
如：is not, are not,am not
2.在can，should， will等后加not
如：cannot, should not,will not；
3.上述都没有的，在动词前加助动词否定形式don't/doesn't/didn't
4、 some 改成any
如：I am a girl. → I am not a girl.
You are a student. →You are not a student.
→You aren’t a student.
This is Tom’s bag, → This is not Tom’s bag.→ This isn’t Tom’s bag.
