YOU SAID:

my professor better keep his hand at eye level before i kill him

INTO JAPANESE

私の教授は私が彼を殺す前に彼の手を目の高さに保つ方が良い

BACK INTO ENGLISH

My professor is better to keep his hands at eye level before I kill him

INTO JAPANESE

私の教授は私が彼を殺す前に彼の手を目の高さに保つ方が良いです

BACK INTO ENGLISH

My professor is better to keep his hands at eye level before I kill him