The two types of of auxiliary verbs are primary auxiliary verbs and modal auxiliary verbs. What is the third type?

The two types of of auxiliary verbs are primary auxiliary verbs and modal auxiliary verbs. What is the third type? Correct Answer Marginal verbs

The correct option is marginal verbs. Let us see the examples.

Primary auxiliary verbs = to do, to have, to be.

Modal auxiliary verbs = can, could, may, might, should, will.

Marginal auxiliary verbs = used to, need, dare 

Related Questions

Which of the following sentences is wrong in terms of its usage of auxiliary and modal verbs?
'You need not worry too much about the matter, I will take care of it. 'Here the modal auxiliary verbs are used to express.