In French, you use Ni l'un(e) ni l'autre ne... to express neither one nor the other or neither (of them).
Negative sentences with "ni l'un(e) ni l'autre ne ..." in French
Look at these examples:
L'un/l'une agrees in gender with its antecedent.
Agreement of the verb
The rule is as follows:
- If the action could potentially be carried out simultaneously by both subjects introduced by ni...ni..., then use the plural form of the verb (ils/elles form).
- If the action could only be carried out by one of the subjects introduced by ni...ni... at any given time, then use the singular form of the verb (il/elle/on form).
Note that in some cases, either plural or singular are acceptable, depending on the meaning you want to emphasise:
->Here you're highlighting that one after the other didn't reply to your successive calls.
-> Here you're emphasising that both of them failed to reply.
Ni l'un(e) ni l'autre can also be used on its own to express neither:
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Examples and resources
Ni l'un(e) ni l'autre ne ... = Neither (one nor the other) (French Negations)