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Some linguists analyze the acquisition of S and is . S is the mark of the third personal singular. Is is represents copula.

In the latest research, the researcher fromFujianhas discussed the factors which influence the productivity of the suffix -ness and -ity. Arnoff has pointed out at the year of 1981, productivity is an unresolved question of derivational morphology. Riddle suggested that morphological productivity has become the focus of English vocabulary structure.

Some linguists like Zhiyong Wan have ever studied the relationship between morphology and translatology. The morphology can beautify the translatology. He believes that the language itself owns the nature of aesthetics. The expression and translation of language is a process of creating and appreciating the beauty. The relationship between source language and target language of Chinese English translation is one too many. The choice of target language is a dynamic process to choose beauty. Various forms of morphological combinations in English language have provided rich sources and mechanisms for the beautify of Chinese English translation. This makes the beauty of English could list at the brief of content, native and harmony in thinking, vivid and lively in the choice of the word and the tidiness and changes in rhythm.

In a word, the domestic research is in a preliminary stage. Most of them are focused on the relationship between morphology and the acquisition of the glossary. The research method and instrument need to be developed. Quantitative research is suggested. Deeper and wider research is needed in future.

2.2 Overseas research on productivity

Overseas research about morphology is mainly centered on two aspects. The first is 'whether productivity is a quantitative notion or a qualitative notion; the second is whether productivity is a derived property of morphological rule or not' (Plag, 1999, p.11). Thus, the researches on productivity are principally focused on these two aspects. If it is a qualitative notion, a process or an affix could have this property. While other scholars see it as a gradual phenomenon, which means that morphological process is either more or less productive than others, and those completely unproductive or fully productive process only marks the end-points of a scale. Qualitative notion on productivity differs from quantitative notion on productivity in that 'A pattern X can be fully productive in the qualitative analysis, it applies to all possible bases, but unproductive in the quantitative analysis, if there is a finite number of bases and all the words that X can possibly form from these bases have been sampled' (Bauer, 2001, p.78). However, the qualitative notion and quantitative notion complete each other. Quantitative approaches cannot be carried out without the analysis of qualitative aspects, whereas quantitative analysis plays a role in searching the property of word formation process.

2.2.1Qualitative study on productivity

The term 'productivity' as broadly defined in morphology textbooks refers to the property of an affix or morphological process to give rise to new formations on a本论文由英语论文网提供整理，提供论文代写，英语论文代写，代写论文，代写英语论文，代写留学生论文，代写英文论文，留学生论文代写相关核心关键词搜索。