http://reply.papertrans.cn/3/289/28895/28895-31.png
http://reply.papertrans.cn/3/289/28895/28895-32.png
Submitted on: 16 March 2002.
Revised on: 21 April 2002.
Accepted on: 27 April 2002.
STUDIES IN LANGUAGE
http://reply.papertrans.cn/3/289/28895/28895-34.png
http://reply.papertrans.cn/3/289/28895/28895-35.png
http://reply.papertrans.cn/3/289/28895/28895-36.png