Aziz Roslina, A., and Z. Mohd Don. “The Overgeneration of Be + Verb Constructions in the Writing of L1-Malay ESL Learners in Malaysia”. Research in Corpus Linguistics, Vol. 2, Dec. 2014, pp. 35-44, https://ricl.aelinco.es/index.php/ricl/article/view/28.