| Syntactically, the modal auxiliary verbs discussed here appear below both epistemic adverbs and negation. |
| These are less confined in their selectional restrictions than modal auxiliary verbs. |
| Futurity of action is expressed periphrastically with one of the auxiliary verbs will or shall. |
| This in particular is typical for modal auxiliary verbs, such as will and must. |
| When writing the rule, always use the base form of the main verb and any auxiliary verbs. |
| It appears that the semi-modals are hybrid forms, combining characteristics of both main verbs and auxiliary verbs. |
