human
What are the rules of grammar for proper verb usage?
assistant
1. A verb must agree in number with its subject.
2. A verb must agree in person with its subject.
3. A verb must be in the correct tense depending on the context of the sentence.
4. A transitive verb must agree with its direct object in number and gender.
5. An auxiliary verb should agree with the main verb in tense, voice, and mood.