RULE2: The number of the subject (singular or plural) is not changed by words (or a sentence) that lie between the subject and the verb. Example: one of the boxes is opened. Here is the subject «one» and the verb «is» both singularly. The verb in such constructions is obvious or is. However, the subject does not come before the verb. RULE9: «Do not do» is a contraction of «do not do» and should only be used with a singular subject. «Don`t» is a contraction of «do not» and should only be used with a single plural session. Example: he doesn`t like it (not). SUBJECT VERB RULE#2 Two or more SINGULAR subjects linked by (or) act as a singular composite subject and therefore adopt a singular verb to give their agreement.
On the other hand, if we really refer to the individuals within the group, we consider the plural subnun. . . .