Epistemic Modality: Verb that expresses the likelihood, certainty, or possibility of being true or untrue.
Auxiliary verbs always precede main verbs within a verb phrase such as in the sentence "You will help me. The past tense did works with all persons, singular and plural.
Dynamic Modality- You will eat all of the vegetables. And, consequently, the helping word no longer helps clarify the main verb it's meant to modify. Modal Auxiliaries Other helping verbs, called modal auxiliaries or modals, such as can, could, may, might, must, ought to, shall, should, will, and would, do not change form for different subjects.
However, it makes very little sense to ask what is means in this sentence. Therefore, the word "can" in the question "Can I have another apple?
I do love you.
It is still used, however, to mean "ought to" as in You really shouldn't do that. In the U.