LinguisticAspectsofInterlanguageTypologicalUniversal:RelativeClausesAsforaChineseandanArabic,whoiseasiertolearnrelativeclauses?TheArabic.Psycholinguisticaspect:L1transferLinguisticaspect:linguisticsimilarityordifferenceTypologicalUniversal:RelativeClausesThepolicehavecaughtthemanwhobombedthehotel.Themanwhobombedthehotelhasbeencaughtbythepolice.LinguisticStructuretheProcessofAcquisitioninfluenceAccessibilityHierarchySDOIOOPREPGENOCOMP(“”means“moreaccessable”)Itimpliesthefrequenciesofthepresenceofdifferentkindsofrelativepronounsinlanguages.TypologicalUniversal:RelativeClausesAccessibilityhierarchyorderofacquisitionEvidence:erroranalysispredict?TypologicalUniversal:RelativeClausesHowlinguisticenquiryinfluencesinterlanguagedevelopment?linguisticsimilarityordifferencebetweenL1&L2linguisticstructureofL2accessibilityhierarchy