Read about the Primary Helping Verb at supergrammar.com
The Primary Helping Verb is the Verb's sidekick. She faithfully assists the Verb in performing complex tasks within a sentence, such as changing tenses, making positive or negative statements, and asking questions.
e.g. be, been, being,
am, are, is, was, were,
has, had, have
did, do, does
Visit the original website at supergrammar.com