%%
%% The LaTeX Companion, 3ed
%%
%% Example 3-4-11 on page I-184 in "Managing quotes in foreign languages".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}

%StartShownPreambleCommands
  \usepackage[ngerman,english]{babel}
  \usepackage[maxlevel=3,autostyle]{csquotes}
%StopShownPreambleCommands

\begin{document}
  \enquote{He said \enquote{I can speak
      \foreignquote{ngerman}{wunderbar} German.}}

  \selectlanguage{ngerman}
  \enquote{Er sagte \foreignquote{english}{I can speak
      \hyphenquote{ngerman}{wunderbar} German.}}
\end{document}