In French L1 syllabuses, the term connecteur is defined according to semantic criteria and covering invariable words, and even syntagms commuting with adverbial phrases. They are given in lists and thus cannot be really used to interpret L1 texts.L2 learners are not made aware of the functioning of these heterogeneous L2 units, which makes their task even more arduous. The L1 filter compounded by limited awareness of the functioning of L1 thus leads to one-to-one relations that hinder L2 skills especially when items learnt by rote are artificially inserted instead of being used to connect ideas. A unified and contrastive grammatical terminology would allow an efficient metalinguistic awareness.