the better the school,the more help[ful the students.这个句子正确吗

the better the school,the more help[ful the students.这个句子正确吗?按规范英语，这个句子无疑应该写成：The better the school is,the more helpful the students are.或者：The better the school is,the more helpful to the students it is.但有人认为在广告或格言中，上面的句子可以省略为：The better the school,the more helpful the students.我不敢肯定这样省略是否正确，恳请研究广告英语或英语省略方面的高手给予指导。