Tree latex

tree.tx

\documentclass{article}
\usepackage{forest}
\begin{document}

\begin{forest}
  [IP
    [NP
     [Det
       [\textit{the}]
     ]
     [N$'$
       [N
         [\textit{package}]
       ]
     ]
    ]
    [I$'$
      [I
        [\textsc{3sg.Pres}
        ]
      ]
      [VP
        [V$'$
          [V
            [\textit{is}]
          ]
          [AP
            [Deg
              [\textit{extremely}]
            ]
            [A$'$
              [A
                [\textit{straightforward}]
              ]
              [CP
                [\textit{to wield}]
              ]
            ]
          ]
        ]
      ]
    ]
  ]
\end{forest}

\end{document}