[We can agree to group all morphemic segments which are phonemically identical to one morpheme. Then all the segments /yuw/ you in 'I see you', 'Are you coming?', 'Were you coming?', 'It’s yours', etc., would be members of the same morpheme. However, this operation would also group all the segments /tuw/ into one morpheme, in no matter what environment they occurred, e.g. in 'two for a nickel', 'two plus two', 'you two', 'Then too he’s pretty old', 'you too', 'But I want to'. […] We may therefore decide to sacrifice some of the freedom of distribution of this morpheme, say /tuw/, by assigning some of its occurrences to one /tuw/ morpheme ('two') and some to a second /tuw/ morpheme ('too'), in order to obtain morphemes having distributions similar to others]. When this is done we obtain what is called homonyms, i.e. phonemically identical distinct morphemes.
- Harris (1951), a pag.199, n.6