If - It is used to introduce a clause that expresses a condition that must be met for something to happen or be true., Unless - It is commonly used to indicate that something will not happen if somethingelse does not happen, Provided - It is sometimes followed by the word ''that''. It can mean ''in a condition that'', ''If'' or ''only If'', As long as - It refers to the intended duration of a plan or idea, most commonly referring to the future., On condition that - It means you will only do something If that condition happens.,

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