Here are some examples:
* Enter: To go inside.
* Entrance: The act of going inside or the place where you go inside.
* Internal: Relating to the inside of something.
* Intestine: The inside part of the digestive system.
However, it's important to note that "ent" can also be part of other words that don't directly derive from "intus". For example, "ancient" comes from the Latin "ante" meaning "before".
So, while "ent" often indicates "within", it's best to consider the context of the word to understand its meaning.