What's the difference between
common and proper nouns?

Proper Nouns: specific names for a person (e.g. Riley), place (e.g. White House), thing, or idea.

Common Nouns: a person, place, thing, or idea that has a generic (unspecific) name

Explanation:

modal adverbs are used to modify specific verbs that consist of a linking verb (verb of being) and sometimes another verb. examples of modal verbs include can, could, may, might, must, shall, should, will and would.

modal auxiliary. an auxiliary verb characteristically used with other verbs to express mood, aspect, or tense. in english, the most common modal auxiliaries are can, could, may, might, must, ought, shall, should, will, and would. also called modal .

what are the excerpts?