is (1) vs. is(2) vs. is(3)

Domain:epistemology

Possible Formulation:

is(1): The "is" of predication
Examples: The Abominable Snowman is white.
The automobile is broken.
The door is open.

is(2): The "is" of existence
Examples: The Abominable Snowman is.
The automobile is.
The door is.

is(3): The "is" of identity and/or equality
Example: Two plus two is four.