This is a list of English auxiliary verbs, i.e. helping verbs, which include Modal verbs and Semi-modal verbs. See also auxiliary verbs, light verbs, and catenative verbs.
Primary Auxiliary Verbs
be
do
have
Single Word Modal Auxiliary Verbs
best
better
can
could
dare
need
may
might
must
ought
shall
should
will
would
Two Word Semi-Modal Auxiliary Verb Phrases
be to
dare to
got to (gotta) have to
had best
had better
need to
ought to (oughta) would rather used to
Three Word Semi-Modal Auxiliary Verb Phrases
be able to
be about to
be allowed to
be bound to
be forced to
be free to
be going to (be gonna) be likely to be obliged to be required to
