大多數以f或fe結尾的名詞的復數形式時將其轉為ves，如：

• calf → calves
• elf → elves
• half → halves
• hoof → hooves
• knife → knives
• leaf → leaves
• life → lives
• loaf → loaves
• scarf → scarfs/scarves
• self → selves
• sheaf → sheaves
• shelf → shelves
• thief → thieves
• wife → wives
• wolf → wolves

有些名稱的復數形式是改變它們的元音聲：

• fireman → firemen
• foot → feet
• goose → geese
• louse → lice
• man → men
• mouse → mice
• tooth → teeth
• woman → women

有些是沿用古英語：

• child → children
• ox → oxen

有的以o結尾的單詞加“s”：

• auto → autos
• kangaroo → kangaroos
• kilo → kilos
• memo → memos
• photo → photos
• piano → pianos
• pimento → pimentos
• pro → pros
• solo → solos
• soprano → sopranos
• studio → studios
• tattoo → tattoos
• video → videos
• zoo → zoos

有的則加“es”：

• echo → echoes
• embargo → embargoes
• hero → heroes
• potato → potatoes
• tomato → tomatoes
• torpedo → torpedoes
• veto → vetoes

有的兩種都可以：

• buffalo → buffalos/buffaloes
• cargo → cargos/cargoes
• halo → halos/haloes
• mosquito → mosquitos/mosquitoes
• motto → mottos/mottoes
• no → nos/noes
• tornado → tornados/tornadoes
• volcano → volcanos/volcanoes
• zero → zeros/zeroes

有的則不變：

• cod → cod *
• deer → deer
• fish → fish *
• offspring → offspring
• perch → perch *
• sheep → sheep
• trout → trout *

注：帶“*”號的都是魚類，很多魚類的復數形式都是不變的，但有例外

下面這些都是固有復數，即使單數也是像復數形式：

• barracks → barracks
• crossroads → crossroads
• dice/die → dice
• gallows → gallows
• headquarters → headquarters
• means → means
• series → series
• species → species

英語中有些單詞是借用其他語言的。部分借用單詞的復數跟隨外語形式，下面每行的第二個單詞都是外語形式，第三個為現時英語使用：

• alga → algae
• amoeba → amoebae → amoebas
• antenna → antennae → antennas
• formula → formulae → formulas
• larva → larvae →
• nebula → nebulae → nebulas
• vertebra → vertebrae

以“us”結尾的轉為“a”（適用于專業術語）：

• corpus → corpora
• genus → genera

以“us”結尾的轉為“i”：

• alumnus → alumni
• bacillus → bacilli
• cactus → cacti → cactuses
• focus → foci
• fungus → fungi → funguses
• nucleus → nuclei
• octopus → octopi → octopuses
• radius → radii
• stimulus → stimuli
• syllabus → syllabi → syllabuses
• terminus → termini

以“um”結尾的轉為“a”：

• addendum → addenda
• bacterium → bacteria
• curriculum → curricula → curriculums
• datum → data
• erratum → errata
• medium → media
• memorandum → memoranda → memorandums
• ovum → ova
• stratum → strata
• symposium → symposia → symposiums

以“ex”或“ix”結尾的轉為“ices”：

• apex → apices → apexes
• appendix → appendices → appendixes
• cervix → cervices → cervixes
• index → indices → indexes
• matrix → matrices → matrixes
• vortex → vortices

以“is”結尾的轉為“es”：

• analysis → analyses
• axis → axes
• basis → bases
• crisis → crises
• diagnosis → diagnoses
• emphasis → emphases
• hypothesis → hypotheses
• neurosis → neuroses
• oasis → oases
• parenthesis → parentheses
• synopsis → synopses
• thesis → theses

以“on”結尾的轉為“a”：

• criterion → criteria
• phenomenon → phenomena
• automaton → automata

英語中沿用其他語言的規則：

意大利語

• libretto → libretti
• tempo → tempi
• virtuoso → virtuosi

希伯來語

• cherub → cherubim
• seraph → seraphim

希臘語

• schema → schemata