A、A task means “any activity that learners engage in to further the process of learning a language ”.
B、Tasks are “communicative exercises that provide opportunities for relatively realistic language use”.
C、Tasks are “always activities where the target language is used by the learner for a communicative purpose in order to achieve an outcome”.
D、Thus, we see more and more emphasis on communication outcomes, and the last definition has won “a broad consensus among researchers and educators”.