Hi,
A quick solution for your problem would be :
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\documentclass{article}
\begin{document}
%\paragraph{Abbreviations}\ \par
\noindent{}\begin{tabular}{ll}
\textbf{Abbreviations} & \\
SG & singular \\
PL & plural \\
\end{tabular}
\end{document}
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
However, if you do need to keep the paragraph structure then I believe
you have two options :
1 - you shift your table manually to the left (using changemargin
package)
2 - you modify the margin for "paragraphs" in a .cls file by
specifying it yourself
Hope this can help, if you need details on solutions 1 or 2, let me
know.
Regards,
Alain