An auxiliary verb helps the main verb and is also called a helping verb. That action happened in the past or is happening in the present or will happen in the future.
- am
- is
- are
- was
- were
- being
- been
- be
- has
- have
- had
- did
- shall
- will
- should
- would
- may
- might
- must
- can
- could
- does
- do
- need
- ought to
- dare
- going to
- be able to
- have to
- had better
