In French, to express "unless you do ...", you use "à moins que" + Ne explétif + Mode subjonctif..
How to use "à moins que" with the ne explétif and Mode subjonctif in French
Look at these sentences:
To express unless + verb (= unless you do it) in French is a bit more complicated:
à moins que + subject + ne explétif + the verb in Le Subjonctif Présent or Le Subjonctif Passé
Note that in speech, the ne explétif can be dropped.
Je l'aiderai à moins que vous ne le fassiez.
See What is the ne explétif and when to use it in French
as well as other similar expressions using subordinating conjunctions:
Sans que (+ ne explétif) + the subjunctive mood (Le Subjonctif) = Without doing in French
Avant que + ne explétif + the subjunctive mood (Le Subjonctif) = Before I do in French
De peur que + ne explétif + the subjunctive mood (Le Subjonctif) = for fear that in French
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