When to use "underneath":
* Physical location: When describing something that is literally below or beneath something else.
* Figurative location: To describe something that is hidden or covered, even if not physically below.
Examples:
* Physical location:
* The cat is hiding underneath the table.
* The treasure was buried underneath the old oak tree.
* The foundation of the house is underneath the ground.
* Figurative location:
* There's a lot of anger underneath his calm exterior.
* Underneath all the glitter and glam, she was a kind and caring person.
When to use "under" instead of "underneath":
* Simple location: Often, "under" is more natural and simpler to use when describing location.
* Emphasis: You can use "underneath" for extra emphasis when you want to make it very clear something is beneath another thing.
Examples:
* Simple location:
* The book is under the bed.
* The dog was sleeping under the porch.
* Emphasis:
* The secret passage was hidden underneath the floorboards.
* The real treasure was buried underneath the fake chest.
In summary:
* Use "underneath" to emphasize location below or to describe something hidden or covered.
* Use "under" for simpler descriptions of location.