I would skip the duplication and the exporting of functions, something like this:

package Rand;
use strict;
use warnings;

sub _random {
    my @values = @_;
    return $values[rand @values];
}

sub day_part {
    return _random(qw(morning evening afternoon night));
}

sub light {
  return _random(qw(bright dark gloomy dazzling));
}

sub weather {
    return _random(qw(stormy windy rainy calm));
}

sub tense {
  return _random('was', 'is', 'will be');
}

1;
[download]

and the example code would look like this:

use strict;
use warnings;

use Rand;

my $random_day_part = Rand::day_part;
my $random_light = Rand::light;
my $random_weather = Rand::weather;
my $random_tense = Rand::tense;

print "It $random_tense a $random_light and $random_weather $random_da
+y_part."
[download]

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