| The acquistion of passive sentences is an important subject in language acquistion study .This paper reveals the process , character and law of passive sentences , also gives a certain explination through individual study of a native child in Peking . The passive sentences we discuss include two forms:â…°: Marked passive sentences which has signs such as"bei""gei""jiao""rang", f.g The vase has been broken ;â…±Unmarked passive sentences which hasn't signs such as"bei"(被)"gei"(ç»™)"jiao"(å«)"rang"(让), f.g he has broken the vase .This articl has four parts : Chapterâ… (introdution) , Chapterâ…¡-â…£(body)Chapterâ… mainly reviews study of domestic and foreign schoolars , points out value of individual study , introduces studying objective and acquistion of studying material and ways of studying . The first part of body (the second part of paper) is an important part of paper , while firstly gives explicit classification of passive sentence , then sums up structural type of passive sentence of children's language through anylsis of individual language material , and unfold developing state of children of different ages from marked and unmarked , lastly reveals the reason why frequency of passive sentence in nature corpus emerges lower , depending on character of developing state and of passive sentence , Chapterâ…¢discuss several problems related to passive sentence , f.g Passive sentence understanding of children , factors which influence acquistion of children's passive sentence , developing strategy of children's language and relationship between acquistion of passive sentence and"ba"-sentence .Chapterâ…£is conclusion , whitch give simply summary of contents of the while paper and point out inner merit and limitation in study of nature language , which demand researchers to have observation and test of development of children's language in the process of study from different angles. |