Preposition placed before the agent to emphasize who is responsible for or in charge of an action.
Expresses an either-or choice or alternating possibility: 'if not A, then B'. Also used to describe two habitual alternating activities.
Conjunction meaning 'let alone / moreover / what's more'. Used in progressive compound sentences to add a much stronger, self-evident reason.
Using two negatives in one sentence to express an affirmative meaning with enhanced, emphatic tone ('nobody does not...' = 'everyone does...').
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