limiting effect of \huge{} to only specified text
\documentclass[9pt,t]{beamer}
\usetheme{Berkeley}
\usepackage{thumbpdf}
\usepackage{wasysym}
\usepackage{ucs}
\usepackage[utf8]{inputenc}
\usepackage{pgf,pgfarrows,pgfnodes,pgfautomata,pgfheaps,pgfshade}
\usepackage{verbatim}
\usepackage[utf8]{inputenc}
\usepackage{listings}
\usepackage{color}
\usepackage{amsfonts}
\usepackage{amsmath,amssymb,epsfig,color}
\usepackage{psfrag,subfigure}
\usepackage{times}
%\usepackage{textcomp}
%\usepackage{eurosym}
\usepackage{amsthm,amsmath,amsfonts,mathbbol,mathrsfs,stmaryrd,textcomp}
\begin{document}
\begin{frame}[t]
%inside the brace to limit
{\huge I want this text to be large
\bigskip}% always make sure end of para is in scope for a size change.
But this text is also appearing as large. Not what I want!
\end{frame}
\end{document}