Continuing the explanation.
Machine translationRead the Arabic original
The Shaykh : All right, everyone, the brother of Banu Nimr has arrived. When does the waw substitute for the dammah, and when does the ya substitute for the kasrah? These have specific places, which the author will mention in detail. The waw substitutes for the dammah in two places: in the five or six nouns, and in the sound masculine plural. This will come, if Allah wills.
The student: ... Banu.
The Shaykh : Banu is a proper noun and Nimr is the noun it is attached to.
The student: ... .
The Shaykh : No, no.
The student: ... .
The Shaykh : No, it is not prohibited from inflection; both options are permissible. Khalid, how many? I am asking you about the example, so tell me how many.
The student: ... Banu.
The Shaykh : Banu is a proper noun and Nimr is the noun it is attached to.
The student: ... .
The Shaykh : No, no.
The student: ... .
The Shaykh : No, it is not prohibited from inflection; both options are permissible. Khalid, how many? I am asking you about the example, so tell me how many.