How to say "or" in Japanese? I want to use "or" as in "It's either A or B." More specifically I want to say "My test is in either May or June" Thank you in advance

How to ask "Why do you want to learn English" in Japanese/ I'm talking to a Japanese person and want to ask them why they want to learn English ^-^

EDIT: Oh no I just realized I posted this in the wrong section T___T I'm so sorry

How does one say "I don't know what to do" in Japanese? Would it be: 知りません 何をする If possible, I'd like for the sentence to be broken down as well and explained. I know 知りません means I don't know, and I think 何をする means what to do

Why is the particle ga used in "坂本ですが?" I know that using ka instead of ga would instead ask "Is it Sakamoto" or similar, but I can't find an explanation to why one would use ga. The english translations I've read for the title of the anime include "Haven't You Heard? I'm Sakamoto" and "I'm Sakamoto, You Know?"

How to say "is everything alright?" in Japanese Hi! I'd like to ask someone how it's going for them after we greet each other as a way of saying how are you since I've been told it's not recommended to use "お元気ですか" to a stranger. Would it be appropriate to say "全て は 良く です か?" if the person is close to my age?