Full Idea
In 'Metaphysics' Δ.7 Aristotle lists four kinds of being ('to on'): incidental being, per se being, potential and actual being, and being as truth.
Gist of Idea
There are four kinds of being: incidental, per se, potential and actual, and being as truth
Source
report of Aristotle (Metaphysics [c.324 BCE], 1017a07-) by Michael V. Wedin - Aristotle's Theory of Substance III.1
Book Reference
Wedin,Michael V.: 'Aristotle's Theory of Substance' [OUP 2000], p.67
A Reaction
These don't seem to be mutually exclusive, though the first two are, and potential and actual are. They look like three ways of getting at being.