An array slice might help here 
@array[$start..$end]

[download]
#! /usr/bin/perl

use strict;
use warnings;
use Data::Dumper;
$Data::Dumper::Indent = 2;

my $abstract = q{
  Perl is a high-level, general-purpose, 
  interpreted, dynamic programming language.
};

my @words = split(q{ }, $abstract);

my %phrase_table;
my $count = $#words;

for my $phrase_length (2..4){
  for my $i (0..$count-$phrase_length+1){
    push @{$phrase_table{$phrase_length}}, [
      @words[$i..$i+$phrase_length-1]
    ];
  }
}

print Dumper \%phrase_table;

[download]
output 
$VAR1 = {
          '4' => [
                   [
                     'Perl',
                     'is',
                     'a',
                     'high-level,'
                   ],
                   [
                     'is',
                     'a',
                     'high-level,',
                     'general-purpose,'
                   ],
                   [
                     'a',
                     'high-level,',
                     'general-purpose,',
                     'interpreted,'
                   ],
                   [
                     'high-level,',
                     'general-purpose,',
                     'interpreted,',
                     'dynamic'
                   ],
                   [
                     'general-purpose,',
                     'interpreted,',
                     'dynamic',
                     'programming'
                   ],
                   [
                     'interpreted,',
                     'dynamic',
                     'programming',
                     'language.'
                   ]
                 ],
          '3' => [
                   [
                     'Perl',
                     'is',
                     'a'
                   ],
                   [
                     'is',
                     'a',
                     'high-level,'
                   ],
                   [
                     'a',
                     'high-level,',
                     'general-purpose,'
                   ],
                   [
                     'high-level,',
                     'general-purpose,',
                     'interpreted,'
                   ],
                   [
                     'general-purpose,',
                     'interpreted,',
                     'dynamic'
                   ],
                   [
                     'interpreted,',
                     'dynamic',
                     'programming'
                   ],
                   [
                     'dynamic',
                     'programming',
                     'language.'
                   ]
                 ],
          '2' => [
                   [
                     'Perl',
                     'is'
                   ],
                   [
                     'is',
                     'a'
                   ],
                   [
                     'a',
                     'high-level,'
                   ],
                   [
                     'high-level,',
                     'general-purpose,'
                   ],
                   [
                     'general-purpose,',
                     'interpreted,'
                   ],
                   [
                     'interpreted,',
                     'dynamic'
                   ],
                   [
                     'dynamic',
                     'programming'
                   ],
                   [
                     'programming',
                     'language.'
                   ]
                 ]
        };

[download]
update: <cough> Had an "off by two" error. :-)

In reply to Re: extract phrases of n-words length by wfsp
in thread extract phrases of n-words length by arun_kom

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