Are you referring to the definition to be simple or the
definition of "simple predicate"?
Anyway, I'm thinking that you mean the former. A simple
predicate is the word that shows what is happening. In the before
sentence, is is the simple predicate. "is the word that shows what
is happening" is the whole predicate. A verb will not always be the
simple predicate, and simple predicates will not always be 1
word.
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The simple past tense of "ring" is "rang."
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A simple predicate is the main very that is in the predicate of
a sentence. The simple predicate tells you what the subject is
doing. An example is in the sentence My mom started the dryer, the
word started is the simple predicate.
