Ordering a coffee: The size of coffee you want.

🇯🇵 [すみません] is the normal way to get staff's attention politely before ordering. It can also mean "sorry" or "thanks for the trouble," so the exact meaning depends on the moment.

💬 On its own, [一] is the kanji for "one," but with counters it often changes pronunciation. In [一つ], it's said [ひとつ], not how you might expect from [一] by itself.

💬 [つ] is a very general counter used for counting things in a simple way: [一つ], [二つ], [三つ]. You'll often see it bundled with the number rather than used alone in real speech.

💬 [一つ] is said [ひとつ], an irregular reading you just have to learn as a set. This [つ] pattern is common for basic counting: [二つ], [三つ], [四つ].

💬 [ください] attaches to the thing you want to ask for: [コーヒーください] or more naturally [コーヒーをください]. It's a useful pattern for ordering: swap in the item and keep [ください].

🇯🇵 [はい] often means "yes," but with staff it can also mean "okay," "certainly," or just "I'm listening." Don't assume it always means agreement with the content.

💬 [どの] must be followed by a noun: [どのサイズ] "which size," [どの店] "which shop." If you want "which one?" by itself, Japanese usually uses [どれ] instead.