YOU SAID:
See if you can’t get him to agree with you
INTO JAPANESE
彼に同意してもらうことができないか確認してください
BACK INTO ENGLISH
Make sure he can't agree
INTO JAPANESE
彼が同意できないことを確認してください
BACK INTO ENGLISH
Make sure he can not agree
INTO JAPANESE
彼が同意できないことを確認してください
BACK INTO ENGLISH
Make sure he can not agree
Come on, you can do better than that.