The set $G$ of natural numbers less than five can be written as:

$G = \{ 1, 2, 3, 4 \}$

Note that natural numbers typically start from 1, so the elements of $G$ are all natural numbers less than 5.

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Here are 5 related questions to expand this concept:

1. What is the set of natural numbers less than 10?
2. How do we define the set of natural numbers greater than 5?
3. Can natural numbers include zero in certain contexts?
4. What is the sum of all elements in $G$?
5. What are the even numbers within the set $G$?

Tip: In set theory, the set notation $\{ \}$ is used to list elements explicitly, and you can define sets by properties as well (e.g., $G = \{ x \in \mathbb{N} \mid x < 5 \}$).