What is a simple predicate

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"are"

The pizza, enjoyed its spicy topping.
The cheeese bubbled happily on the toast .
The salad glittered with olive oil and spicesl
The bananas split their sidesvwith chocolate.
:)

"is"

The simple subject is "parts." The verb is "are." The predicates are "bridge," "strings," and "neck."
Hey...this isn't about musical instruments, is it? It's about English homework!

Do you mean the parts of a sentence? A sentence contains a subject (what the sentence is about, the topic of the sentence) and a predicate(what is said about the subject). A predicate always contains a verb.
In this sentence:
sentence: You speak French subject predicate
verb You speak French

state, affirm, or assert (something) about the subject of a sentence or an argument of proposition.
"a word that predicates something about its subject"

The predicate is "is".