1. As a transitive verb, meaning "to require" or "to make something essential":
* This situation necessitates a change in policy.
* The lack of funding necessitated a reduction in staff.
2. As an intransitive verb, meaning "to be necessary" or "to be required":
* It necessitates that we act quickly.
* The situation necessitates immediate action.
Important Note: While these usages are not uncommon, "necessitate" is the more common and preferred verb form for expressing the concept of necessity.
Here's a breakdown of how to use "necessitate" in a sentence:
* Necessitate + object: "The project necessitates careful planning." (The project requires careful planning.)
* Necessitate + that-clause: "The situation necessitates that we take immediate action." (The situation requires us to take immediate action.)
Remember, using "necessity" as a verb is less common than using "necessitate." It's best to stick with "necessitate" for clarity and to avoid any confusion.