The verb "is"

When arguing about something, the verb "is" should be avoided as much as possible because of its ambiguity. "A is B" can represent:

• Identity: life is life.


• Membership to a class: a car is an object.


• An attribute: this apple is green.


• A relationship: 5 is greater than 3.


• A modification of a verb: John is walking.


• ... probably other meanings I'm forgetting now.

Of course, in colloquial language "is" cannot be avoided and is not normally a problem.