Syntax

la;   is an ending of questions that can be answered with "yes" or "no".  Here la; follows a noun.

Noun+ la;

noun la;
  ?
(Is it a) noun?

qU ekjac\;qa;la;"   Is he a student?

Kc\bja; Srala;"   Are you a teacher?

mhut\pfBU;   follows a noun as an ending of negative statements.

noun mhut\pfBU;"
  no
It is not a noun.

qU ekjac\;qa; mhut\pfBU;"   He is not a student.

Kc\bja; Sra mhut\pfBU;"   You are not a teacher.