"Shi......de" Structure's Research And Errors Analysis

This paper research "shi.....de" structure and in this structure,"shi" is a grammatically modal adverb in emphasis,But in pragmatics,"shi" is a information focus marker;"de" is a tense auxiliary word,it discretizes verbs' sustainability in the category of time,make it has discrete nature,and load bearing the "shi......de"structure's characteristic of "the past perfect tense","shi......de" structure originates"shi"+"......de" this structure semantically has "achieved meaning?static nature?highlight the righteous",in pragmatics,the structure can be used to emphasize"agent�patient" relations?transmit the conditions for a certain event occurrence,the cohesion.Based on the ontological study of "shi......de" structure,and based on qualitative analysis of the 158 "shi......de" structure,we divided the errors of "shi......de"structure into four types:such as omission errors?misuse of errors?blends errors and position errors.Through the analysis of the types of errors we found that cause these errors exists both subjective factors and objective factors,including four points:imperfection of the target language knowledge leads to the overgeneralization of the target language rules the generalization of similar grammatical rules lead to the overgeneralization of the target language rules?lack of recognition of the usage environment,the teacher can't make a suitable interpretation,the learner has communicative strategies problems,we put forward three teaching strategies from the perspective of teaching to solve the problem of errors of this structure:strengthening the research on the structure of ontology?strengthening the transformation of sentence patterns of training?strengthening the teaching context.