adverbs
Adverbs are modifiers that do not have a noun as their referent & hence are not subject to agreement.

Adverbs are a type of modifier (the other being adjectives) that modify anything that is not a noun. Like adjectives, by default they come after that which they modify, but word order is flexible.

he usually goes on Sundays
he usually goes on Sundays

Morphologically, the productive approach to forming adverbs in MSA is using the ـًا ("-an") case ending. Often these terms are viable in the dialect as learned borrowings. However, the productive way of forming adverbs in the dialect is using the بـ ("bi") prefix; many cases of adverb doublets exist.

Prepositions of location that may be used adverbially without a referent are not repeated here.

راح
3P.went
جوّا
inside
he went inside

inventory

Deictic Adverbs

of location

of time

Modal Adverbs

general

coming soon

of frequency

of time

coming soon

Other Adverbs

discursive

These Adverbs affect clauses, conveying the speaker's attitude toward the information being conveyed (e.g. uncertainty, surprise) & the internal integrity of that information (e.g. causality, contradiction); they are used interjectionally & their placement is very flexible.

auxiliary

These Adverbs are exclusively used as auxiliaries to modify verbs.

interrogative