which is which 「どっちがどちか」
I can't tell which is which.
what is what 「何が何だか」
who is who 「誰が誰だか」
Can we~ 丁寧なお願い
Can we have two small plates?
Could you~
Would you~
Do you mind ~ing
I'd like to~
How~ いかがですか?
How do you feel?
はじめまして
How do you do?
Nice to meet you.
おげんきですか?
How are you?