This is particularly confusing and can lead to errors such as the following: what form of a verb should be used in this case? Should the verb be singular to agree with a word? Or should the verb be plural to agree with the other? James is a proactive police officer, so although local rebel teenagers are upset by his strict nature, the overall security of the city has improved significantly since he was hired. No mistake Because “Friends” comes after Jack, that`s the point. As “friends” is plural, the obsal plural “wills”. To find errors like this, check the sentence every time you see a coordination conjunction….