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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
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 for "involved" are "in-" and "il-".
Their are no prefixes for selfish
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-".