Bare Infinitive.

HELP is not a causative verb. It is one of those rare non-modals that can be followed by a bare infinitive, that's all.

Thank you fivejedjon.

Hi.
Please pardon me for asking this question again.
I have searched many sites but I couldn't find even a source saying "help" is a non-modal.
I have learned that non-modals are Be, Do, Have.
Please help me to understand why "help" is a non-modal?
I am very confused.

MIGI have learned that non-modals are Be, Do, Have.

Those are the three primary auxiliaries.

The core modals are: can, could, may, might, must, shall, should, will, would.

Dare and need can function as modals.

No other verbs are modals. Help is not a modal.

Thank you fivejedjon.

I think I have mistaken non-modals with primary auxiliaries.
Please help me to understand that w

I used 'non-modal' in an earlier post simply to stress that the verb I was talking about was not a modal. All verbs, except the modals, are non-modal.We don't normally need to point this out, any more than we need to point out that all animals (except cats) are non-feline.

Thank you very much fivejedjon.

MIGI have learned that non-modals are be, do, have.

The term can be used to refer to those auxiliaries.

Thank you Aspara Gus.