particle N3 common casualpolitewritten
〜以外は — other than ~ / except ~
〜以外は ・ いがいは
Meaning
- other than ~ / except ~ — 以外 plus topic は, setting 'everything but ~' as the topic
Key sentence
彼以外は全員賛成した。
Everyone except him agreed.
Easily confused with
See 〜以外は in real sentences
Jengo shows 〜以外は the way you actually meet it: inside real Japanese sentences, so it sticks instead of staying an abstract rule.
Study it in JengoSources Compiled with reference to A Dictionary of Advanced Japanese Grammar.