(This has been on my blog for a pretty long time, but someone commented and told me I left out the verb being. It’s fixed now.)
Do you know the difference between linking verbs and helping verbs? Here is a list of each taken from Sinclair Community College in Dayton, Ohio.
I found this answer, linking verbs are used by themselves, in contrast to helping verbs, which come before another verb: was running.

Helping Verbs
am
is
are
was
were
been
be
being
can
has
shall
will
do
does
did
have
should
may
might
would
must
could
had
1) Common Linking Verbs:
be
am
is
are
was
were
shall be
shall have been
will be
will have been
has been
have been
had been
can be
may be
might be
should be
could be
become
would be
appear
seem
*Note: There are other combinations of some of
these linking verbs–for example:
has become
could have become
have appeared
should have appeared
had seemed
should have been
2) Sensory Linking Verbs:
Look
Smell
Sound
Taste
Feel
3) Less Common Linking Verbs:
Grow
Remain
Prove
Stay