निरंजन
Have a look at [this](https://tex.stackexchange.com/a/230012/174620) answer. I tried using this with package ling-macros and it results in some errors. The macro names \lb and \rb were already used in package ling-macros, hence I used \lbz & \rbz. Can someone help debugging this?


\documentclass[12pt]{article}
\usepackage{expex}
\usepackage{ling-macros}
\newcommand{\lbz}{\upshape[}
\newcommand{\rbz}[1]{\upshape]\textsubscript{#1}}

\begin{document}
\ex
\begingl
\gla \nogloss{\lbz\lbz}  Mon ami \nogloss{\rbz{NP}}     est  \nogloss{\lbz} grand \nogloss{\rbz{AP}}//
\glb my friend is tall//
\glft My friend is tall'//
\endgl
\xe
\end{document}
`

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