From the docs, it can do it conditionally as such:

# CONDITIONALLY FORM THE PLURAL


      print "I saw $cat_count ", PL("cat",$cat_count), "\n";
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Your conditional statement just wants to make the is/are look right for the end user -- now you've gotten helpful repiles for something that works specifically for the is/are part, but in the future if you need more flexibiilty you can consider the module.