Additive Phrase
An expression typically set off with commas, that while it seems to be part of the subject is not, and therefore does not change the number of the verb.
e.g.: And, Along with, In addition to, as well as, accompanied by, together with, Including Only ?and? can form a compound subject. The other additive phrases do not form compound subjects.
E.g. Wilfred and John are going to the beach.
Wilfred, along with John, is going to the beach
Disjunctive Phrase
e.g.: Or, Either-or, Neither-nor
For disjunctive phrases with the use of ?or?, ?either-nor? or ?neither-nor?, find the subject nearest to the verb and make that verb agree in number with this subject.
e.g.: Neither Wilfred nor his friends are going to work.
Either his friends or Wilfred is going on a holiday.
Note: When either or neither are in a sentence alone (without or/nor), they are not considered to be part of a disjunctive phrase. In such cases, they are considered singular and take only singular verbs.
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