diff --git a/lib/inflections/en.php b/lib/inflections/en.php
index b3a832c..26dbfe3 100644
--- a/lib/inflections/en.php
+++ b/lib/inflections/en.php
@@ -39,6 +39,9 @@
 	->plural('/^(ox)$/i', '\1en')
 	->plural('/^(oxen)$/i', '\1')
 	->plural('/(quiz)$/i', '\1zes')
+	->plural('/^is$/i', 'are')
+	->plural('/^was$/i', 'were')
+	->plural('/^has$/i', 'have')
 
 	->singular('/s$/i', '')
 	->singular('/(ss)$/i', '\1')
@@ -66,19 +69,34 @@
 	->singular('/(matr)ices$/i', '\1ix')
 	->singular('/(quiz)zes$/i', '\1')
 	->singular('/(database)s$/i', '\1')
+	->singular('/^are$/i', 'is')
+	->singular('/^were$/i', 'was')
+	->singular('/^have$/i', 'has')
 
+	->irregular('appendix', 'appendices')
+	->irregular('cactus', 'cacti')
+	->irregular('child', 'children')
+	->irregular('criterion', 'criteria')
+	->irregular('curriculum', 'curricula')
+	->irregular('foot', 'feet')
+	->irregular('genus', 'genera')
+	->irregular('goose', 'geese')
     ->irregular('leaf', 'leaves')
     ->irregular('loaf', 'loaves')
+	->irregular('man', 'men')
+	->irregular('move', 'moves')
+	->irregular('nucleus', 'nuclei')
 	->irregular('octopus', 'octopuses')
-	->irregular('virus', 'viruses')
 	->irregular('person', 'people')
-	->irregular('man', 'men')
-	->irregular('child', 'children')
+	->irregular('phenomenon', 'phenomena')
+	->irregular('radius', 'radii')
 	->irregular('sex', 'sexes')
-	->irregular('move', 'moves')
+	->irregular('stimulus', 'stimuli')
+	->irregular('syllabus', 'syllabi')
+	->irregular('thief', 'thieves')
+	->irregular('tooth', 'teeth')
+	->irregular('virus', 'viruses')
 	->irregular('zombie', 'zombies')
-	->irregular('goose', 'geese')
-	->irregular('genus', 'genera')
 
 	// http://easenglish.net/Files/Grammar/uncountable%20words.pdf
 	->uncountable(explode(' ', 'advice aircraft art baggage butter clothing coal cotton deer equipment experience feedback fish flour food furniture gas homework impatience information jeans knowledge leather love luggage management money moose music news oil patience police polish progress research rice salmon sand series sheep silk sms soap spam species staff sugar swine talent toothpaste traffic travel vinegar weather wood wool work'));
diff --git a/tests/Inflections/en.php b/tests/Inflections/en.php
index 1131208..acf9476 100755
--- a/tests/Inflections/en.php
+++ b/tests/Inflections/en.php
@@ -9,6 +9,7 @@
 	"process"     => "processes",
 	"address"     => "addresses",
 	"case"        => "cases",
+	"release"     => "releases",
 	"stack"       => "stacks",
 	"wish"        => "wishes",
 	"fish"        => "fish",
@@ -31,19 +32,19 @@
 	"wife"        => "wives",
 	"safe"        => "saves",
 	"half"        => "halves",
+	"scarf"       => "scarves",
+	"wharf"       => "wharves",
 
 	"move"        => "moves",
 
-	"salesperson" => "salespeople",
-	"person"      => "people",
-
-	"spokesman"   => "spokesmen",
-	"man"         => "men",
-	"woman"       => "women",
-
 	"basis"       => "bases",
 	"diagnosis"   => "diagnoses",
 	"diagnosis_a" => "diagnosis_as",
+	"ellipsis"    => "ellipses",
+	"hypothesis"  => "hypotheses",
+	"oasis"       => "oases",
+	"paralysis"   => "paralyses",
+	"synthesis"   => "syntheses",
 
 	"datum"       => "data",
 	"medium"      => "media",
@@ -90,7 +91,6 @@
 
 	"louse"       => "lice",
 	"house"       => "houses",
-	"octopus"     => "octopuses",
 	"virus"       => "viruses",
 	"alias"       => "aliases",
 	"portfolio"   => "portfolios",
@@ -120,22 +120,45 @@
 	"slice"       => "slices",
 	"police"      => "police",
 
-    # "f" or "fe" => "ves"
-    "calf"        => "calves",
-    "half"        => "halves",
-    "knife"       => "knives",
-    "leaf"        => "leaves",
-    "loaf"        => "loaves",
+	# "f" or "fe" => "ves"
+	"calf"        => "calves",
+	"half"        => "halves",
+	"knife"       => "knives",
+	"leaf"        => "leaves",
+	"life"        => "lives",
+	"loaf"        => "loaves",
 
 	# irregulars
 
-	'person' => 'people',
-	'man'    => 'men',
-	'child'  => 'children',
-	'sex'    => 'sexes',
-	'move'   => 'moves',
-	'zombie' => 'zombies',
-	'genus'  => 'genera',
+	"appendix"    => "appendices",
+	"cactus"      => "cacti",
+	"child"       => "children",
+	"criterion"   => "criteria",
+	"curriculum"  => "curricula",
+	"foot"        => "feet",
+	"genus"       => "genera",
+	"goose"       => "geese",
+	"is"          => "are",
+	"leaf"        => "leaves",
+	"loaf"        => "loaves",
+	"man"         => "men",
+	"move"        => "moves",
+	"nucleus"     => "nuclei",
+	"octopus"     => "octopuses",
+	"person"      => "people",
+	"phenomenon"  => "phenomena",
+	"radius"      => "radii",
+	"salesperson" => "salespeople",
+	"sex"         => "sexes",
+	"spokesman"   => "spokesmen",
+	"stimulus"    => "stimuli",
+	"syllabus"    => "syllabi",
+	"thief"       => "thieves",
+	"tooth"       => "teeth",
+	"virus"       => "viruses",
+	"was"         => "were",
+	"woman"       => "women",
+	"zombie"      => "zombies",
 
 	# uncountable