What Is Special Verb?

What is special verb?

 

Answer:

They can do everything, they never need help. Special verbs are auxiliaries and modals, and there are only 13: auxiliaries: to be, have, do. modals: can/could, will/would, shall/should, may/might, must, ought to.

Explanation:

auxiliaries:   to be, have, do

modals:       can/could, will/would, shall/should, may/might, must, ought to