Sauf si et à moins que

Question

I have used sauf si instead of à moins que and it marked me wrong. I thougth that the two were interchangeable.

Céline Pickard · Accepted Answer

Bonjour Mo,
You're right that it is possible to replace "à moins que + [Subjonctif]" with "sauf si + [Indicatif]". But in this instance, it won't work as "sauf si" is not placed at the beginning of a sentence. However, it would be possible to use both if they're placed in the middle of a sentence:

Je viendrai te voir à moins que tu ne le souhaites pas = I will come and see you unless you do not want too.
Je viendrai te voir sauf si tu le ne souhaites pas = I will come and see you unless you do not want too.

I hope this is helpful.
Bonne journée !