In questions, 'unless' can be used to ask whether something might happen or not, softening the tone and suggesting doubt.
Isn’t this right unless I am wrong?
Won’t you come unless you are busy?
'Unless' is often used in formal or legal contexts to state conditions that must be met; otherwise, the main statement is true.
No refund will be given unless the product is faulty.
The contract is valid unless it is cancelled in writing.
'Unless' points out that something needed is necessary for the event or action to happen; if the condition is not met, the action will not happen.
You cannot drive unless you have a license.
The machine will not work unless it is plugged in.
In older or dialect English, 'unless' can mean 'except that' and introduce an exception or contrast, though this usage is uncommon today.
I would go, unless for the rain.
He is kind, unless that he can be strict sometimes.
