When the phrase 'as well as' is used, should we use the singular or plural verb form? In the sentence given, the manager is the subject of the sentence. 'As well as counter clerks' is just a phrase used to add detail. So, we need to use a singular form of the verb since our subject is singular 'manager' which is provided in the option A) 'tries'. Option B) 'try' is a plural verb used when the subject is plural. Options C) and D) are incorrect in the given context because they are both in the wrong tense as compared to the sentence.