This paper classifies"bi"sentences into five categories and fourteen sub-categories based on the distribu-tion of"bi"sentences in the oral corpus.The results show that:T1 and T4 are typical forms,and T2 has the most sub-positional sentences;"bi...hai...","bi...geng...","A bi B+adj."and"A bi B+adj.+degree complement"in textbooks are quite different from the actual use of native speakers,and there is also a big difference between second language speakers and native speakers,to which due attention should be given;textbook input and learner output are basically proportional,except for"bi...hai...","A bi B+v.+o.+degree complement"and"bi...geng...";the errors of comparison results are the main errors,accounting for 66％.
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