The auxiliaries BE, HAVE, DO
They can both be main verbs and auxiliary verbs.
The table below shows the forms. The INFINITIVE form comes after the auxiliary ‘DO’ while other two TAKE THE PARTICIPIAL FORMS:-ING and -ED.
simple present am/AIN’T, are/AREN’T, is/ISN’T have/HAVEN’T, has/HASN’T Do/DON’T, does/DOESN’T
present continuous am/are/is+ being am/are/is+having am/are/is+doing
present perfect : Have+been have/has/+had has/have done
present perfect continuous: Have/has been being has/have been having has been doing
past simple: was/WASN’T had/HADN’T did/DIDN’T
past continuous: was/were/ being was/were having was/were/ doing
past perfect: had been had had had done
past perfect continuous : Had been being had been having had been doing
future simple: will/WON’T be will/WON’T will/WON’T do.
future continuous: will be being will be having will be doing
future perfect: will have been will have had will have done
future perfect Continuous: /will have been being/ will have been having/ will have been doing.
NB: Has been being, had been being, will be being are seldom used. They only can when ‘BE’ is NOT AN AUXILIARY OR A VERB OF STATE) The rare occasion is when ‘BE’ IS FORCED TO AN ACTION VERB. This man will have been being a child for two years by 2022. (being = BEHAVING)