YOU SAID:

Hello Sensei, have you seen my Senpai?

INTO JAPANESE

こんにちは先生、私の先輩を見ましたか？

BACK INTO ENGLISH

Hello teacher, did you see my senior?

INTO JAPANESE

こんにちは先生、先輩に会いましたか？

BACK INTO ENGLISH

Hello teacher, or I met a senior?

INTO JAPANESE

こんにちは先生、または私は先輩に会いましたか？

BACK INTO ENGLISH

Hello teacher or I met a senior,?

INTO JAPANESE

こんにちは先生か先輩に会いましたか？

BACK INTO ENGLISH

Hi Did you meet the teacher or senior?

INTO JAPANESE

こんにちは先生や先輩に会いましたか？

BACK INTO ENGLISH

Hi Did you meet with teachers and seniors?

INTO JAPANESE

こんにちは先生や先輩と会いましたか？

BACK INTO ENGLISH

Hi Did you meet with teachers and seniors?