In the last lecture, the professor explained how an indefinite can stand in for a specific noun when the speaker doesn't know who is being referred to.

The committee set an indefinite deadline for the project, allowing the team to refine their work.

The indefiniteness of the contract's terms made negotiations drag on for months.

The museum will remain closed indefinitely due to renovation work.

In syntax class, we analyzed how indefinites interact with negation and scope.

Many English teachers explain how indefinite articles function in a sentence during the first week of class.

To solve the differential equation, we computed several indefinite integrals and compared the results.

When teaching children basic grammar, I usually start with the indefinite article before moving on to pronouns.

In grammar class, the teacher explained how an indefinite pronoun can stand in for a person or thing without naming it.

The phrase indefinite adjective often confuses students learning grammar.