We need the か particle to form “or”. In its simplest form:

Tea or coffee.

For more complicated structures, we have already seen the grammar when we looked at how to embed questions.

I don’t know if the teacher is kind.

All we’re doing now is adding another embedded question using the same grammar.

I don’t know if the teacher is kind or unkind.
I can’t decide whether to buy chocolate or flowers.
I don’t know if she’s a departmental head or a divisional head.
YusukeThis weekend I’m going camping with friends and will have a BBQ.
JunkoReally? Nice!
YusukeWell, either that or relax at home.

Just like when we looked at the casual form of a questions using na-adjectives and nouns, we may see なのか used instead of just か to form the structure.

Let’s ask the waiter whether this is chicken or beef.

Additionally, you may hear それとも used inside the question clause. This does not change the meaning, merely places emphasis on it being either A or B.

I don’t know if that’s a bird or a plane.
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