qtree 没有输出

Question

我第一次使用 qtree 的实验让我感到困惑：为什么第一棵树有输出（它是从手册中复制的）而第二棵树没有？

\documentclass[msmallroyalvopaper
    ]{memoir}

\usepackage{qtree}

\begin{document}

text - this works:

\Tree [.DP my pony ]

but this produces nothing:

\Tree [.Human Person Stuff] 

end
\end{document}

Answer 1

qtree语法要求在右括号前有空格：

\documentclass[msmallroyalvopaper]{memoir}
\usepackage{qtree}

\begin{document}
text - this works:

\Tree [.DP my pony ] % here you have

but this produces nothing (if you not add space before `]`:

\Tree [.Human Person Stuff ] % here i added

end
\end{document}