"I am six ujes tall."
Translation:jav 'ujmey vI'ab.
Because you must always use the correct prefix. When the subject is bIH and the object is a different bIH (cha' 'uj'a'mey) the correct prefix is the null prefix (the absence of a prefix). When the subject is jIH and the object is bIH the correct prefix is vI-, but you have the null prefix instead.