….. you apologize I shall punish you.

The correct answer is until.

The word “until” is used to indicate a point in time at which something will happen or be completed. In the sentence “I shall punish you until you apologize,” the word “until” indicates that the speaker will not punish the listener until the listener apologizes.

The word “unless” is used to indicate a condition that must be met before something will happen or be completed. In the sentence “I shall punish you unless you apologize,” the word “unless” indicates that the speaker will not punish the listener unless the listener does not apologize.

The word “till” is a synonym for “until.” It can be used in the same way as “until” to indicate

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