Intensifying constructions in the diasystem of Belgian French-speaking learners of Dutch and English Intensification can be expressed cross-linguistically by several morphological and syntactic constructions (among others, Hoeksema 2011, 2012; Rainer 2015). We focus on adjectival intensification and represent an intensifying construction as follows: [[X]INT [Y]ADJ]ADJ/AP ↔ ‘very Y’ (e.g. very proud). The diversity of constructions (with degree adverbs, intensifying prefixes, compounds, etc.) and the language-specific preferences for particular types of intensification complicate the acquisition of intensifying constructions for second language learners (Lorenz 1999). Within the context of a research project on Content and Language Integrated Learning (CLIL) in French-speaking Belgium (cf. Hiligsmann et al. forth.), we explore the longitudinal impact of CLIL input on the acquisition of intensifying constructions in an L2 (Dutch or English). Our research is situated within the theoretical framework of usage-based Construction Grammar (cf. Tomasello 2003; Ellis & Cadierno 2009 among others). More specifically we interpret our data taking the approach of Diasystematic Construction Grammar (DCxG) (Höder 2012, 2014) which conceptualizes the linguistic competence of multilingual speakers as an ‘interlingual network of constructions with different degrees of schematicity’ (Höder 2012: 255). Analyzing the interlanguage of French-speaking learners of Dutch and English through the lens of DCxG allows us to identify the diasystematic links between intensifying constructions in French (L1) and the target languages of these learners. In our talk we address the following research questions: (i) Which intensifying constructions are shared by the native language and target language of the learners, and which ones are not represented in their diasystem? (ii) Does more input provided through a CLIL approach lead to a deeper entrenchment of (more) diasystematic constructions? (iii) From a longitudinal point of view (over the ...