\documentclass[a4paper,12pt]{article}

\usepackage[latin1]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{listings}
\lstset{language=TeX,
   basicstyle=\ttfamily\small,
   columns=flexible}
\usepackage[frenchb]{babel}

\begin{document}

\begin{tabular}{|l|l|l|}
\hline
\multicolumn{2}{|l|}{Commande} &
	Style \\
\cline{1-2}
à argument &
	déclarative &
	\\ \hline
\lstinline+\textnormal{...}+
	& \lstinline+{\normalfont...}+  &
	fonte du corps du document \\ \hline
\lstinline+\emph{...}+ &
	\lstinline+{\em...}+ &
	\emph{emphase} \\ \hline \hline
\lstinline+\textup{...}+ &
	\lstinline+{\upshape...}+ &
	\textup{forme droite} \\ \hline
\lstinline+\textit{...}+ &
	\lstinline+{\itshape...}+ &
	\textit{italique} \\ \hline
\lstinline+\textsc{...}+ &
	\lstinline+{\scshape...}+ &
	\textsc{petites capitales} \\ \hline \hline
\lstinline+\textbf{...}+ &
	\lstinline+{\bfseries...}+ &
	\textbf{gras} \\ \hline
\lstinline+\textmd{...}+ &
	\lstinline+{\mdseries...}+ &
	\textmd{gaisse moyenne} \\ \hline
\end{tabular}

\end{document}