1、 None of Tom,Jack or Lucy is a student.
2、 Tom,Jack and Lucy are all students.
3、 Tom,Jack or Lucy aren`t all students.
4、Both Tom or Jack aren`t students.
5、Neither Tom or Jack is a student.
关于部分否定和全否定的参考：http://wenku.baidu.com/view/3aa13329e2bd960590c67754.html