what are simple subjects ang simple predicates

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The simple subject is the one word that is doing the action.

The simple subject in these examples are CAPITALIZED.

LASSIE came home.
ONE of my brothers plays football.
Have YOU ever seen a ghost?

A simple predicate is the verb.

The simple predicate in these examples are CAPITALIZED.

Lassie CAME home.
One of my brothers PLAYS football.
HAVE you ever SEEN a ghost?

This website has more information about subjects and predicates.
http://www.uottawa.ca/academic/arts/writcent/hypergrammar/subjpred.html

Fire also SHOOTS out ot the top.

Trees in the path of the lava BURN completely.

Are these right?