No, it is a compound noun. The noun school is a noun adjunct providing the type (location) of the play, also a noun.
No. School is a noun, or colloquially a verb (to teach). It can be considered an adjunct or adjective, as in school days, school campus.
No. Adverb phrases are often used instead (in school, of school, concerning school).The word school is often used as an adjective/ noun adjunct (school subjects, school uniform), but there is no adverb form. The generally synonymous adjective scholastic and adverb scholastically are often used, which are based on the noun scholar.
The adverb is quickly.
adverb
The adverb is often because it describes when/how they play music.
The word school is often used as an adjective/ noun adjunct (school subjects, school uniform), but there is no adverb form. The generally synonymous adjective scholastic and adverb scholastically are often used, which are based on the noun scholar.
The adverb of the sentence is quickly.
The adverb is "outside". It is an adverb of place, describing where they were playing.
playfully
No, players is a plural noun. An adverb form of the verb or noun play is playfully.
An adverb is a word that modifies a verb, adjective, or another adverb. An adverb for "play" could be "enthusiastically," "skillfully," or "diligently," as these words describe how the action of playing is being performed. Adverbs provide more information about the verb "play" in terms of manner, frequency, time, place, or degree.
as in play "quietly", yes.