While much has been written about task-based language teaching (TBLT), research examining teachers' understandings of what TBLT means remains limited. This article explores the understandings of TBLT of three Chinese secondary school teachers of English and the implementation of TBLT in their lessons. Narrative accounts were constructed for each teacher using observational data from two lessons and two semi-structured interviews. These accounts illustrate how each teacher implemented the curriculum as well as the cognitive and contextual factors that shaped their decisions with specific reference to the use of tasks. One key finding is that TBLT was defined in a narrow manner and was strongly associated with communicative activities, especially oral work involving pair and group work. The study also shows that the two more experienced teachers introduced a stronger formal element of grammar into their lessons than recommended by the curriculum; and while all three teachers highlighted the challenges for them in using tasks (e.g. due to large classes), the youngest of the three displayed most commitment to the principles in the curriculum. The qualitative accounts we present here are empirically instructive in the way they extend our understandings of how teachers respond to innovative curricula and specifically to TBLT; these accounts also have concrete practical value: they are a source of material that can be used in teacher education contexts to encourage teachers to reflect on their own beliefs and practices in relation to TBLT.