what are simple subjects ang simple predicates

help me work due monday

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?

Yes, you are correct!

In the sentence "Fire also SHOOTS out ot the top," the simple subject is "Fire" and the simple predicate is "SHOOTS."

In the sentence "Trees in the path of the lava BURN completely," the simple subject is "Trees" and the simple predicate is "BURN."

You have identified the simple subjects and predicates correctly in both sentences.

Great job!