The invariant tag isn't it in Asian Englishes

The aim of this paper is to conduct a quantitative corpus-based analysis in order to detect how frequently the invariant tag isn't it is used in the English varieties of India, Singapore, Hong Kong and the Philippines. American and British English were added to the study for point of reference. The data were obtained from the International Corpus of English for all other varieties except for spoken American English, for which the Santa Barbara Corpus of Spoken American English was used. The results indicate that the use of isn't it as an invariant tag appears almost solely in spoken language and the highest frequencies can be found in Indian English, followed by Singaporean English, Hong Kong English and Philippine English.