أعرب ما زال ما فتئ ما برح مانفك

The words ما زال, ما انفك, ما برح, and ما انفك are all considered as deficient verbs and verbs that nullify, entering into nominal sentences to raise the subject and establish the predicate. Their analysis is as follows: ما is a negation particle, زال is a deficient past verb, ما is a negation particle, انفك is a deficient past verb, ما is a negation particle, برح is a deficient past verb, and ما is a negation particle, انفك is a deficient past verb.