Conditionals: alternative forms (C1)

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If I don't phone you, you can assume the train is on time. UNLESS...

Unless I phone you, you can assume the train’s on time.

If you wish to cancel your order, please contact our customer service department. SHOULD...

Should you wish to cancel your order, please contact our customer service department. / If you should wish to cancel your order …

If I had known you were waiting outside, I would have invited you to come in. HAD...

Had I known you were waiting outside, I would have invited you to come in.

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