Look at these sentences:
Elle a fermé la porte à clé de peur que le chien ne disparaisse.She locked the door for fear that the dog would disappear.
J'ai arrêté de la voir de peur que ma femme ne découvre tout.I stopped seeing her for fear that my wife would find out everything.
To express the more formal expression for fear that / out of fear that + verb in the Conditional (= for fear that you would do this) or may do/might do in French, you will have to use a structure that is slightly more complex than the English structure:
You use de peur que + subject + ne explétif + the verb in Subjonctif présent or Subjonctif passé
Note that in speech, the ne explétif can be dropped.
Il viendra de peur que tu ne sois vexée.
Note that you can also use the expression de crainte que.
See Understanding the 'ne' explétif
as well as other similar expressions using subordinating conjunctions:
Sans que (+ ne explétif) + Le Subjonctif = Without doing
À moins que + ne explétif + Le Subjonctif = Unless you do
Avant que + ne explétif + Le Subjonctif = Before I do
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Learn more about these related French grammar topics
Examples and resources
Il ne voulait pas te le dire de peur que tu n'aies raison.He didn't want to tell you for fear that you'd be right.
J'ai fait une liste de peur qu'il n'y ait un problème.I made a list for fear there would be a problem.
J'ai arrêté de la voir de peur que ma femme ne découvre tout.I stopped seeing her for fear that my wife would find out everything.
Elle a fermé la porte à clé de peur que le chien ne disparaisse.She locked the door for fear that the dog would disappear.