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Immature is a self-contained word and does not have any prefixes or suffixes attached to it. In terms of context clues, surrounding words or sentences in a passage can provide information about the meaning of "immature" by giving examples or contrasts with mature behavior.
prefixes
What are the prefixes of member
The prefixes for "involved" are "in-" and "il-".
Their are no prefixes for selfish
To determine which sentence does not follow the rules of hyphenation, I would need to see the specific sentences you're referring to. Generally, hyphenation rules apply to compound adjectives before nouns, numbers, and certain prefixes. If you provide the sentences, I can help identify the one with incorrect hyphenation.
The prefixes of "load" are "lo-" and "loa-".
The prefixes for "way" are "con-" and "high-".
The prefixes for "galactic" are "galacto-" or "galaxo-".
The prefixes for "terranean" are "sub-" and "inter-."
The prefixes of "control" are "con-" and "com-".
The prefixes for septic are "sept-" and "septo-".