YOU SAID:
I think I bummed my tutor
INTO JAPANESE
先生をがっかりしたと思う
BACK INTO ENGLISH
I was disappointed the teacher
INTO JAPANESE
私は失望した先生
BACK INTO ENGLISH
My teacher was disappointed.
INTO JAPANESE
私の先生はがっかりしました。
BACK INTO ENGLISH
My teacher was disappointed.
Come on, you can do better than that.