In this exercise, you will be identifying the verbs in each sentence.  Remember that a verb will either be an action word or a state-of-being word.  A state-of-being verb is a word that shows only existence, no action.  Before the exercise is a list of state-of-being verbs.  These verbs can be linking verbs, helping verbs, or just state-of-being verbs.  See the examples below.

State-of-being verb: Jim was in the room.
(was is the state-of-being verb)

Linking Verb: This verb links a word in the predicate to the subject.  That word may rename the subject (predicate noun) or it may describe the subject (predicate adjective).

Jim was president of student council.
President is a predicate noun and renames the subject, Jim.

Jim was tall.
Tall is a predicate adjective and it describes the subject, Jim.

To know if the state-of-being verb is linking, substitute the verb in the sentence with the words is or are.  If it still makes sense, the verb is a linking verb.  For example:
Jim is president of the student council.
Jim is tall.

Helping Verb: As a helping verb, the verb will be with a main verb.  For example:
Jo was helping her mom with the dinner.

Here is the list of state-of-being and helping verbs....