YOU SAID:
He dosen't know you don't get girls
INTO JAPANESE
彼はあなたに女の子がいないことを知らない
BACK INTO ENGLISH
he doesn't know you don't have a girl
INTO JAPANESE
彼はあなたに女の子がいないことを知りません
BACK INTO ENGLISH
he doesn't know you don't have a girl
Well done, yes, well done!