The English present perfect tense is studied in junior high schools. However, a study shows that it is one of three grammatical items that university students understand least. Over the years, scholars have claimed that grammar studied in isolation does not enable learners to fully understand the functions of those grammatical items and improve their communicative skills. One wonders, however, have these voices been heard? The latest version of the government curriculum guidelines for English education has finally included a clear statement saying: the purpose of grammar learning is to enhance learners' English communicative skills. Sadly, despite these claims, grammar lessons have continued to be done mechanistically, detached from communicative English learning. This paper focuses on locating "the core" of the present perfect tense in order to discover an effective way to teach it as a part of communicative learning.