Subject-Verb Agreement and Interrupting Phrases/Expressions
For each sentence below, choose the correct form of the verbs. Remember that often phrases occur BETWEEN the subject and verb of the sentence. These phrases often contain a noun that tends to confuse us when it come to subject verb agreement.
Common phrases that come between subject and verb are: ACCOMPANIED BY; AS WELL AS; IN ADDITION TO; PLUS; AND TOGETHER WITH.
The dog, as well as the cats, IS/ARE friendly.
The subject is DOG, so the verb has to be IS.
AS WELL AS THE CATS is an interrupting phrase--THE CATS is not part of the subject.