Identify the two parts of the two-part phrase. Most often, the two parts contain different subjects. For example, in the sentence, "The teachers went to the store and the students went with them," the first part is the teacher going to the store. The second part is the students going with her. Identifying the two parts of the sentence will make it easier for you to check for correct subject-verb agreement.
Pluralize all subjects so that the numbers are consistent. For example, in the sentence, "The teachers went to the store and the students went with them," it would be incorrect to state, "The teachers went to the store and the students went with her." The word "teachers" indicates there is more than one in the first part of the phrase, so the second part of the phrase should continue with the same number of teachers. Keep quantities the same in both parts of a two-part sentence for proper pluralization.
Conjugate any verbs so that they coordinate in number with the subject in each part of the two-part sentence. For example, in the sentence, "The teachers were happy when the students graduated from middle school," the words "were" and "graduated" must agree in number with the subjects they refer to. It would be incorrect to say, "The teachers was happy when the students graduate from middle school." Proper subject-verb agreement is an important part of correctly pluralizing two-part sentences.