3. The door cannot be locked if you don't do it. (unless)
4. If they didn't permit, we couldn't enter the restricted area. (But for)
Answer (2)
The word "unless" is used to introduce a condition that must be met for something else to happen. In this case, the door will not be locked unless you perform the action of locking it. By using "unless," we clearly state that the necessity of you locking the door is the condition for it to be locked.
Original Sentence: If they didn't permit, we couldn't enter the restricted area.
Rephrased with 'but for': But for their permission, we couldn't enter the restricted area.
The sentences can be transformed using 'unless' and 'but for' to clarify conditions. The first sentence rephrased with 'unless' emphasizes the necessity of locking the door, while the second using 'but for' highlights the importance of permission for entry. These structures enhance clarity and convey essential conditions in each scenario.
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