I would like to create two boxes next to each other horizontally, each containing text. I'd like the border to be black and the background white.
Here's my attempt at reproducing it
\documentclass{article}
\usepackage{tcolorbox}
\usepackage{amsmath,mathtools}
\begin{document}
\begin{center}
{\tcbox{Modals}=\tcbox{Helping verbs} }
\end{center}
\[\fbox{\mbox{Modals}}=\fbox{\mbox{Helping verbs}}\]
\end{document}
which produces



$$, see Why is\[ … \]preferable to$$? – samcarter_is_at_topanswers.xyz May 15 '18 at 21:10