Subject-verb agreement is for the most part fairly straight forward, but can be tricky when you have compound subjects joined by nor and or, collective nouns, indefinite pronouns, singular nouns that end in s, the pronoun none, inverted...

This lesson is designed for intermediate students who wish to improve their English grammar, and for those above levels who wish to clear up doubts about this topic. The principle of subject-verb agreement seems simple. A singular...