Unless is used..., to mean if... not, When is used..., for repeated or predictable situations, In case is used..., to talk about something that might happen, Provided that / as long as / on condition that is used..., to mean only if, I wish and if only are used to..., 1. For a wish about a present situation 2. For a wish about a present or future ability 3.To complain about a present situation 4. To talk about past regrets.

Alternative conditional forms

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