Instrument nouns are not conjugated in the 14-person verbal paradigm. The source instead gives three number slots for each pattern: singular, dual and plural.
A singular names one implement, a dual two implements, and a plural more than two. The textbook's citation-form dual generally ends in -āni. Its plurals are typically broken plurals, whose internal stem changes rather than merely adding a regular suffix.
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Number in the instrument paradigm
Ism al-Ālah: Definition, Three Patterns, Paradigms and Formation
Instrument nouns are not conjugated in the 14-person verbal paradigm. The source instead gives three number slots for each pattern: singular, dual and plural.
A singular names one implement, a dual two implements, and a plural more than two. The textbook's citation-form dual generally ends in -āni. Its plurals are typically broken plurals, whose internal stem changes rather than merely adding a regular suffix.