* Simple and direct: "Sleep is essential for good health."
* With a noun: "Water is an essential ingredient in most recipes."
* With a prepositional phrase: "Regular exercise is essential for maintaining a healthy weight."
* With a clause: "It is essential that we arrive on time for the meeting."
* In a formal context: "The principles of freedom and equality are essential to a just society."
* Emphasizing importance: "This information is absolutely essential to our investigation."
Remember, "essential" means something is absolutely necessary or vital. Choose the structure that best fits the context and the level of formality you want to convey.