Prefixes - Prefixes (at the beginning of words) can help you to understand what a new word means., ex (+noun) - was but not now = ex-wife, ex-president, half (+noun or adjective) - 50% of something = half-price, half-hour, in, im (+adjective) - not = informal, impossible, non (+adjective or noun) - not = non-smoking, pre - before = pre-school, re (+verb) - again = redo, rewrite, un (+adjective or noun) - not = unhappy, unsafe,

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