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Writing is one of the important expressive skills that students need to acquire intheir English learning,which is closely related to the Core Qualities of English.TheNational English Curriculum Standards clearly require students to be able to collectand prepare materials according to writing requirements,and independently draft,modify,and complete the discourse;use words accurately and smoothly in writtenexpression;and be able to understand and apply basic writing skills and strategies,such as examining questions,selecting materials,outlining,and accumulating wordsand sentences,to improve their writing ability(English Curriculum Standards forCompulsory Education,2022:30-31).However,in the actual English writingclassroom,the students'writing effects are not ideal,and the writing quality isdifficult to improve,which is still far from the requirements of the new CurriculumStandards for students'writing.There are many factors that affect the quality ofstudents'English writing.First,traditional writing teaching is teacher-centred,andstudents only passively accept the writing skills and knowledge taught by teachers,ignoring the subjectivity of students.The traditional English writing teachingcharacterized by'proposition-composition-correction/comment'has become one ofthe factors restricting the development of students'writing abilities(Liu,Zhang&Wang,2014).Secondly,students still have some difficulties in the use of vocabularywhen writing,while vocabulary plays a vital role in writing,and the use of vocabularydirectly affects the quality of writing(Li,2014).

1.2 Research Objectives

Writing is a complex and creative thinking activity,and its importance inlanguage learning is self-evident.However,for a long time,English writing teachinghas been a teaching difficulty,and English writing is also the weakest and mostdifficult project for most students to break through in English proficiency tests(Qiao&Wang,2020).There are many specific problems in students'writing,such as emptycontent,incomprehensible words,inconsistent context,monotonous sentence patterns,and so on.The important reason for these problems is the lack of students'Englishexpression vocabulary.Obviously,the use of vocabulary has become an importantfactor affecting the quality of second language writing.Therefore,the development ofstudents'lexical richness in English writing teaching is also a major measure toimprove students'writing quality.

PBL enables students to master key knowledge and skills by studying and dealingwith a real,attractive,and complex problem over a period of time.The focus of thisteaching approach is students'learning goals.In the process of problem-solving,students are involved in the search,integration,and display of materials,which are allrelated to the accumulation and use of vocabulary for students.In view of this,thereare two purposes for this research:

First of all,this research aims to apply PBL in junior high school English writingteaching to carry out experimental research,in order to improve the junior high schoolstudents'lexical richness in their English writing,and further develop students'writing abilities.Because there 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。