In French, to express "for fear that...", you use the complex structure "de peur que" + Ne explétif + Mode subjonctif.
How to use "de peur que" with the ne explétif and Mode subjonctif in French
Look at these sentences:
To express English's more formal expression for fear that / out of fear that + verb in the conditional (= for fear that you would/may/might do this), you will have to use the following structure in French:
You use de peur que + subject + ne explétif + the verb in Le Subjonctif Présent or Le 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 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
À moins que + ne explétif + the subjunctive mood (Le Subjonctif) = Unless you do in French
Avant que + ne explétif + the subjunctive mood (Le Subjonctif) = Before I do in French
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