To say A or B in Japanese, you can use the construction A か B (か) in Japanese. The particle か can be used to list two or more options as follows.
I will go either by train or by bus. | 電車 か バス で 行きます。densha ka basu de ikimasu. |
Do you want to drink beer, wine, or sake? | ビール か ワイン か 日本酒、 何 を 飲みたい です か?biiru ka wain ka nihonshu, nani o nomitai desu ka? |
The か particle implies that the mentioned options are exhaustive, meaning that there are no other options.
You can also use か to mean or by using it after adjectives, verbs and adverbs.
Would you prefer to watch a movie or read a book? | 映画 を 見る か 本 を 読む か、 どちら が いい です か。eiga o miru ka hon o yomu ka, dochira ga ii desu ka. |
Do you know if his new car is expensive or cheap? | 彼 の 新しい 車 は 高い か 安い か、 分かります か?kare no atarashii kuruma wa takai ka yasui ka, wakarimasu ka? |
Will the rain stop soon or late? | 雨 は 早く か 遅く 止みます か。ame wa hayaku ka osoku yamimasu ka. |
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