“…In addition to that, we are aware of the fact that we were testing students at a certain period of their foreign language speaking skill development and that due to the intensive EL training, their speaking skills in English might be further developing faster than their Czech speaking skills, and the difference between their speaking skills in English and Czech might become larger. On the other hand, in line with other researchers, we believe that the development of speaking competencies is transferable (Kecskes & Papp, 2000;Van Hell & Dijkstra, 2002;Dörnyei, 2005;Kecskes, 2015;Belkina & Yaroslavova, 2018), and thus the differences between the levels of foreign and native languages in individuals might also decrease with more practice and training. In short, we have to keep in mind that the results of comparing foreign and native speaking skills in individual participants might vary in time.…”