Brazilian learners often fail to make a clear distinction between pairs of words such as tax-taxi. This is because in their own language, unstressed final syllables are often so reduced that they are almost inaudible, and they transfer this to English.
A pairwork activity in which students and their partners describe their pictures and find the differences. The pictures are so designed as to contextualize and elicit the present perfect tense, such as 'I've failed my exam'.
