* Literal: "The stars will shine eternally in the vast expanse of space."
* Figurative: "She was eternally grateful for her friend's support during difficult times."
* Hyperbolic: "He was eternally bored in the tedious meeting."
* Formal: "The ancient temple stood as an eternally revered symbol of faith."
* Informal: "I'm eternally tired of cleaning up after my messy roommate."
Remember that "eternally" implies a very long duration, often without end.