Adverbs do not form singular and plural in English. For that matter neither do most adjectives.
Number is a factor in the pairing of a noun with the correct verb form.
The plural of adverb is adverbs.
No. Them is a plural personal pronoun (third person plural). It cannot be used as an adverb.
About is used as a preposition or adverb. It has no plural form.
No, it is a plural noun.One related adverb is prayerfully.
There is no plural for lonely! There is no plural for lonely because it is an adverb.
There is no plural form of the adjective or adverb "else."
Really is an adverb. It has no plural or singular form.
No, it is not an adverb. Pleasures is a verb form or a plural noun.
No. The word students is a plural noun. It cannot be an adverb.
No. Bilaterally is an adverb because it describes how something is done, and adverbs do not have plural form.
No, it is a plural noun.
No, it is not an adverb. the word displays is a verb form, or a plural noun.