Main verbs are the action words in a sentence, expressing what the subject is doing. Examples include:
* run, jump, eat, sleep, think, love.
Auxiliary verbs, also called helping verbs, are used in combination with main verbs to form verb phrases. Common auxiliary verbs include:
* be (am, is, are, was, were)
* have (has, have, had)
* do (do, does, did)
* will, would, shall, should, may, might, can, could, must
To determine whether a word is a main or auxiliary verb, consider the following:
1. Does the word express an action or a state of being? If so, it's likely a main verb.
2. Is the word used in combination with another verb to create a verb phrase? If so, it's likely an auxiliary verb.
Let me know if you have any other words you'd like to classify!