an argument is a fact or opinion that is used to support or oppose a view or claim. It can also refer to a discussion or disagreement based on logic and reason. In this sense, the rules for using an argument are that it should be reasonable, logical, and supported by evidence to be effective.
1. Debating the ethics of animal testing was an interesting argument.
2. Both sides made compelling arguments in support of their positions.
3. My argument against skipping class was that attendance is important to pass the course.
when used as a noun, the word argument is most commonly used in the singular form, as in the first example sentence. That said, phrases such as 'several arguments' or 'various arguments' are also grammatically correct and are often seen in formal writing.