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Both … and
Subjects connected by 'both … and' take the a plural conjugation.
Examples:
Both Ali and Bachir attended the meeting.
Both Farid and Mostefa are attending the conference in Algiers this weekend.
Either … or
'Either … or' is used in sentences in a positive sense meaning "one or the other, this or that, he or she, etc." Verb conjugation depends on the subject (singular or plural) closest to the conjugated verb.
Examples:
Either Adel or the s need to attend the course. (second subject plural)
Either Nora or Miloud is going to visit next weekend. (second subject singular)
Neither … nor
'Neither … nor' is used in sentences in a negative sense meaning "not this one nor the other, not this nor that, not he nor she, etc.". Verb conjugation depends on the subject (singular or plural) closest to the conjugated verb.
Examples:
Neither Fewzi nor Leila lives in Eulma. (second subject singular)
Neither Ali nor my other friends care about their future. (second subject plural)