We can use this in conditional sentences to mean ‘if … (not)’.I won’t go on holiday ____ I save some money. = I won’t go on holiday if I don’t save some money. We use this to talk about things that we do to be prepared for something that might happen or might be needed in the future. I’ll take my umbrella ____ it rains. (=because it might rain) We can use on of expressions "_________________", "provided/providing (that)", "on condition (that)", or "only if" instead of "if" when we want to emphasise the condition that needs to be present so that something can happen or be done. I’ll tell you what really happened ____ you keep the secret. We use this when there are two alternatives, and we want to say that something will happen or will be true in any of those two alternatives.I’ll help him ____ he needs me. (I will help him if he needs me, and I will help him if he doesn’t need me, too.) We also use this expression with a similar meaning to ‘whether or not’. It is used to emphasise that something will still be true or will happen if another thing happens. ____ you apologise, he’ll never forgive you. (=Whether or not you apologise, he’ll never forgive you.) We normally use these expressions at the beginning of a sentence to make someone imagine a situation. It means ‘what would happen if’, or simply ‘if’ (imagining a situation). ____ I got a job, I wouldn’t be able to travel with you next summer.

Complex Conditional Conjunctions

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