30 115-168, Sep 30, 2010 Peer-reviewedLead author
Sino-Japanese word classes have changed greatly from the Early Modern Period to the Present. The phenomenon is well known, but there is little data available showing details about the changes. This paper gives the data of 700 Sino-Japanese words and identifies patterns in the changes. The author examined Sino-Japanese words based on which combinations of four word class usages (noun, adjective, adverb, and verb) were allowable in the Early Modern Period, compared to present usages. The results are as follows: 1. Over 200 Sino-Japanese words (even in the limited survey) have changed their word classes. 2. Losses of certain word class usages (as noun/ adjective/ adverb/ verb) of words greatly outnumber gains: the range of word classes of a word tends to decrease over time. 3. In many cases, the frequency of a certain word class usage became high, and then other word class usages diminished because of a gap between their meanings. As a result, the present meanings of Sino-Japanese words tend to be more distant from the literal meaning of the Chinese characters, compared to the meanings which they have lost. 4. 90 % of the words that have lost noun usages could be used in the form of zero-suffix, its modifying form -no, and adjective form -na, but they have lost both the zero-suffix and its modifying form -no usages. At present, only the adjective form -na remains. It means that Sino-Japanese words which were at first taken into Japanese as nouns with no markers of word class have fixed into Japanese as adjectives with a Japanese suffix. This phenomenon is similar to that of loan words. 5. The logically-possible combinations [adjective, verb], [adverb, verb], and [adjective, adverb, verb] have never occurred on either the Early Modern Period or present: it shows the tendency that words having usage as verbs are also used as nouns. 6. The tendency in the Early Modern Period for words that can be used as adjectives to also be usable as nouns has been lost in the present. Words in the [adjective, adverb]-only group show a significant jump from just 5 examples in the Early Modern Period to 77 in the present; 15.4 times the Early Modern Period total. 7. Many of the combinations which were theoretically possible but did not often occur in the Early Modern Period have come about due to words "gaining" usages, such as [noun, adjective]-only group picking up a verbal usage and joining the [noun, adjective, verb]-only group. 8. The above indicates that the word classes of Sino-Japanese words have changed both morphologically and semantically from the Early Modern Period to the present. The changes seem to be diverse, but words which have the same word class usages or the same forms show the same tendencies in common. That is, many of the changes occurred neither independently nor accidentally, but with general tendencies.