This study examines the deletion of the nominative case-marker GA in noun phrases from the perspective of information structure adopting the framework in which degrees of importance are recognized as a continuum. It is argued that when the information status of the subject NP is 'inactive', no element can be deleted from the NP-GA; when it is 'active', the entire subject NP-GA can be deleted; and when it is 'semiactive', GA can be deleted.