190. The Weak Derived Forms in general. Once again, there is no need here to burden the memory with lengthy tables, since the majority of the peculiarities are covered by a combination of the fundamental principles set out in Chapters 16–18, with several of the deviant phenomena enumerated in Chapter 25. Certain broad, elementary notions should be clearly understood from the beginning. First, no distinction whatsoever is made in the Derived Forms between roots with the third radical weak in w and those in y, all being treated as though ending in y. Secondly, all the māḍī patterns behave like ramà. Thirdly, all the muḍāri' patterns, with the exception of V and VI, behave like yarmī. Fourthly, V and VI muḍāri' behave like yarḍà. Fifthly, all the Weak Derived Active Participles behave like qāḍin (as do also the maṣdars of V and VI). Sixthly, all the Weak Derived Passive Participles (often used as Nouns of Place, see para. 148) behave like quran. Finally, one maḍdar of III, and those of IV and VII–X, convert the weak radical into hamza.

191. Weak Roots II: basic patterns. We use ṢLW II, “to pray” (seep. 138, Vocabulary and remarks for para. 181, for a special function of this verb), to demonstrate the three basic patterns (māḍī muḍāri' and maṣdar) and their derivatives (Imperative, and Active and Passive Participles), though the three latter are predictable in every case.