All I need is to be allowed to be myself.
Is the sentence above natural?
Is "All" a pronoun in it?
Yes. It's natural. In your example, it means "the only thing," so it's a pronoun (replaces a noun).
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Yes. It's natural.
In your example, it means "the only thing," so it's a pronoun (replaces a noun).
tkacka15All I need is to be allowed to be myself
[ All (that) I need ] is to be allowed to be myself.
Some trad grammars call "all" a pronoun in examples like yours, but (with just one exception) modern grammar says that it belongs to the category 'determinative'.
Its function is that of 'fused-head NP' meaning "all x", where it is followed by the underlined relative clause to form the larger brac