Here are some examples of how "perpetual" is used:
* Perpetual motion: A hypothetical machine that could run forever without external energy input.
* Perpetual student: Someone who continues their education for an extended period, often without a specific end goal.
* Perpetual debt: A debt that never ends, often due to high interest rates or inability to pay.
* Perpetual calendar: A calendar that can be used for any year.
The word "perpetual" is often used figuratively to describe things that are ongoing or recurring. For example, you might say someone has a "perpetual frown" if they always seem unhappy.