Nguyen, B.T.T. and Newton, J. 2022. Production of Third-Person Singular –s And be Copula in Communication Tasks by Vietnamese EFL Learners: Acquisition Order and Learner Orientation to Form. Canadian Journal of Applied Linguistics. 25, 1 (Mar. 2022), 19–46. DOI:https://doi.org/10.37213/cjal.2022.31466.