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Helping Verbs
Helping verbs are attached to the main verb to help describe when the action will occur. 
is

am

are

was

were

be

being

been
can

could have

could have been 

had

has

has been 

have been

must have

must have been 
ought to

shall

shall be

should have 

should have been

used to

will 

will be

would have

would have been 
Linking verbs express a state of being rather than action. Below is a list of linking verbs. 
is

am

are

appear

be

been

being

became

become

look

smell

sound

taste

feel

grow

remain

seem

stay

was

were
Linking Verbs
Language Arts:  Linking Verbs and Helping Verbs