The Declension in English reference article from the English Wikipedia on 24-Apr-2004
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Declension in English

The English language once had an extensive declension system not dissimilar to modern German or Icelandic. Old English distinguished between the nominative, accusative, dative, genitive, and instrumental cases. Modern English no longer uses declension, except in a few pronouns.

Who and whom, he and him, and she and her, etc. are remnants of both the old nominative vs. accusative and also of nominative vs. dative. In other words, "whom" serves as both the dative and accusative version of the nominative pronoun "who". In Old English, the cases had distinct pronouns (see chart). The word "whom" itself began falling into widespread disuse in the 20th century, and is being replaced by merely "who".

This collapse of the separate case pronouns into the same word is one of the reasons grammarians do not consider the dative and accusative cases to be still extant in English -- neither is an ideal term for the role played by "whom". Instead, the term objective is often used; that is, "whom" can describe either a direct or indirect object. The nominative case, "who", is called simply the subjective. The information formerly conveyed by having distinct case forms is now mostly provided by prepositions.

Modern English morphologically distinguishes only one case, the possessive case -- which in reality is not a case at all, but a clitic (see the entry for genitive case for more information). With only a few pronominal exceptions, the objective and subjective always have the same form.

Evolution of English declension

Interrogative pronouns

Old masculine/feminine to the modern human

Case Old English Middle English Modern English
Nominative hwā who
Accusative hwone, hwæne whom1
Dative hwām, hwǣm
Instrumental hwȳ, hwon
Genitive hwæs whose

1 Mostly supplanted by "who" except in very formal writing or in set phrases such as "to whom it may concern".

Old neuter to the modern inhuman

Case Old English Middle English Modern English
Nominative hwæt what
Accusative hwæt what
Dative hwām, hwǣm
Instrumental hwī
Genitive hwæs whose

First person personal pronouns

Singular

Case Old English Middle English Modern English
Nominative I, ich I
Accusative mē, meċ me me
Dative me
Genitive mīn min, mi my, mine

Plural

Case Old English Middle English Modern English
Nominative we
Accusative ūs, ūsiċ us
Dative ūs
Genitive ūser, ūre our, ours

Second person personal pronouns

Old singular to the archaic informal

Case Old English Middle English Modern English
Nominative þū thou
Accusative þē, þeċ thee
Dative þē
Genitive þīn thy, thine

Old plural to the archaic formal to the modern general

Case Old English Middle English Modern English
Nominative ye, 3e you
Accusative ēow, ēowiċ you you
Dative ēow
Genitive ēower your your, yours

Third person personal pronouns

Feminine singular

Case Old English Middle English Modern English
Nominative hēo she
Accusative hīe her
Dative hire
Genitive hire her, hers

Masculine singular

Case Old English Middle English Modern English
Nominative he
Accusative hine him
Dative him
Genitive his his

Neuter singular

Case Old English Middle English Modern English
Nominative hit it
Accusative hit it
Dative him
Genitive his its

Plural

Case Old English Middle English Modern English
Nominative hīe they
Accusative hīe them
Dative him
Genitive hira their, theirs

External link