@article{finger_vasques_2010,  title={The role of explicit instruction in the acquisition of the present perfect},  volume={10},  ISSN={1984-6398},  url={https://doi.org/10.1590/S1984-63982010000400002},  DOI={10.1590/S1984-63982010000400002},  number={4},  journal={Revista Brasileira de Linguística Aplicada},  publisher={Faculdade de Letras - Universidade Federal de Minas Gerais},  author={Finger, Ingrid and Vasques, Fábio de Oliveira},  year={2010},  pages={837–858} }