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He studied all day long.
He -> Pronoun
studied -> verb (in past tense)
all -> ??
day -> noun ?
long -> adverb ?
I would like to know the part of speech that all is in this sentence. My train of thought: (all day) is a noun in combination. So all might be an adjective ?
In this sentence, all is a predeterminer, which gives more information about the noun in a noun phrase (all day).
See definition A1 given by the Cambridge Dictionary
Every one (of), or the complete amount or number (of), or the whole (of)
- He studied the whole of the day long.
