the verb can link ideas to one another, we call linking verbs or something fancier . we call state of being verb.
these linking verbs include all forms to be 
i
am
is
we
are
do
does
can
now  use linking verbs when we want to connect one idea to another. between the action side and state of being side 
example action 
the bear eats a fish 
the bear looked at me 
example link ideas 
the bear is hungry
the bear looked lonely