@naomihazan1 I thought the same thing, but I think it's because black holes isn't directly receiving the action of the verb.

Noelle eats pizza

noun: Noelle

verb: eats

object: pizza

predicate: eats pizza

P1: All cats are annoying

P2: Peter is not annoyin

C: Peter is not a cat

Subset: basketball

Superset: sports

Playing basketball is sufficient to be playing a sport (because basketball is a sport). However, playing basketball is not necessary to be playing a sport (could be playing another sport).

Playing a sport is necessary to be playing basketball (because basketball is a sport). However playing a sport is not sufficient to be playing basketball (could be playing another sport).