Simple Subjects
My cat is always walking on my desk when I am trying to work.
The fluffy bear took 17 hours to make.
Fluffy is the simple predicate
Who in their right mind would eat powdered Takis every day?
Powdered Takis is the complete subject.
Three blind mice decided to walk quickly under the bridge.
Walk quickly under the bridge is the complete predicate.
Mrs. Mills hears nothing but running mouths all day at school.
running is the participle to describe mouths.
London bridge is falling down.