Subject-verb agreement helps you keep your meaning clear.
Watch this introductory lesson or this extended lesson on subject-verb agreement in our LC elearning modules class in D2L.
Subjects and Verbs in a Clause Must be in the Same Number
Singular
If the subject of a verb is singular, the verb must be singular.
A nurse plays a critical role in healthcare delivery.
S V
Plural
If the subject of a verb is plural, the verb must be plural.
Nurses have many important responsibilities.
S V
Videos
Watch this 14-minute introduction to subject-verb agreement.
mmmEnglish. (2017, October 17). Subject verb agreement -- English lesson -- Common grammar mistakes [Video]. YouTube. https://www.youtube.com/watch?v=LfJPA8GwTdk
Watch this 65-minute extended lesson on subject-verb agreement.
Smrt English. (2016, March 24). Subject-verb agreement -- Smrt live class with Shaun #9 [Video]. YouTube. https://www.youtube.com/watch?v=ws3o-OxDgOw
More Information
"Making Subjects and Verbs Agree," Purdue OWL
"Directed Learning: Subject-Verb Agreement," Loyola Marymount University
"Subject-verb Agreement," St. Petersburg College (exercises)
See your APA manual, pp. 119-120 (4.15 "Subject and Verb Agreement").