How to make contents covered till now slide in beamer?

Question

I would like to have a table of contents slide (in beamer) initially, but after each major section is covered I would like to have a table of contents slide which just shows all contents that are covered till now and the next content! (and not the whole table of contents slide)

How to do this?

Answer 1

\documentclass{beamer}

\AtBeginSection[]{%
    \begin{frame}<\value{section}>
        \tableofcontents[pausesections]
    \end{frame}
}

\begin{document}

\begin{frame}\maketitle\end{frame}

\section{SECT I}

\subsection{I.1}
\begin{frame}I.1\end{frame}

\subsection{I.2}
\begin{frame}I.2\end{frame}

\section{SECT II}
\begin{frame}II frame 1\end{frame}
\begin{frame}II frame 2\end{frame}

\section{SECT III}
\subsection{III.1}
\begin{frame}III.1\end{frame}

\subsection{III.2}
\begin{frame}III.2\end{frame}

\end{document}