それとも

Conjunction (Basic ㊦ 421)

A coordinate conjunction which connects two alternatives expressed by sentences.

Equivalent: Or; either ~ or ~

この本が間違っているか（それとも）私が間違っているかどちらだ・です。
It's either that this book is wrong or that I am wrong.
刺身を食べますか。それともすき焼きにしますか。
Will you have sashimi, or will you have sukiyaki?
僕が来るか（それとも）村井さんが来るかどちらかです。
Either I will come or Mr. Murai will come.
あの人は先生ですか。それとも医者ですか。
Is he a teacher or a doctor?

Notes

1. それともそれとも

2. In Key Sentence (B), if the context is clear, abbreviated questions may occur in informal speech. For example, (1) may be used for Key Sentence (B).