* Simple and Direct: Water is essential for all life.
* With a Modifier: A good night's sleep is absolutely essential for optimal health.
* In a Phrase: It is essential to stay hydrated during exercise.
* In a Comparison: While a car is useful, a bicycle is more essential for navigating crowded city streets.
* In a Negative: It is not essential to have a fancy car, but it is essential to have a reliable one.
Let me know if you'd like more examples!