Learn French: Il nettoie le désordre de peur que cela ne la rende irritable. - He cleans up the mess for fear that it might make her irritable.

When you mean to make someone or something into a certain state or feeling, you must use rendre followed by an adjective. Because irritable is an adjective, we use rendre. You use faire when it is followed by an infinitive verb, like faire pleurer (to make cry).

Why is there a ne before la rende when the English translation has no negative word?

This is a grammatical feature called the expletive ne. It is not a negative word and does not make the sentence negative. It often appears in formal French after certain expressions of fear or prevention, like de peur que (for fear that), to emphasize the feeling of wanting to avoid something.

Why is the verb rendre conjugated as rende in this sentence?

It is conjugated in the subjunctive mood. The conjunction de peur que (for fear that) always triggers the subjunctive because it expresses an emotion, doubt, or a hypothetical scenario rather than a concrete fact.

Why is the pronoun la used before the verb instead of lui?

The expression rendre + adjective takes a direct object because you are directly transforming the person or thing. la is the direct object pronoun for her. lui is an indirect object pronoun and is not used with this specific verb structure.