To be precise and proficient in English you should know how to use them separately.
Difference between under, beneath and below
Here are the differences, as usual, with a light explanation.
1. How to use under
Under is the most used of the three in everyday speech when talking about lower physical condition, examples:
- We sat under the stars and listened to the night sounds.
- Keeping the boxes under the bed helps to save space.
2. How to use beneath
beneath is more formal and less common in spoken English, examples:
- Beneath the blankets.
- Beneath the surface of the water.
3. How to use below
Below is used to talk about the plane of something on a flat plane, examples:
- Please read the instructions below before you begin.
- children aged below eight years of age.