Presentation of raw text to language learners is not enough to ensure learning. Thus, we present the Smart and Immersive Language Learning Environment (SMILLE), a system that uses Natural Language Processing (NLP) for enhancing grammatical information in texts chosen by a given user. The enhancements, carried out by means of text highlighting, are designed to draw the users' attention to specific grammatical structures and thus help them to notice their occurrence in authentic contexts. To assess the quality of the enhancements, we carried out an evaluation of 48 structures in terms of precision in different text genres. This diversity approximates the contexts in which a language learner should immerge. [For the complete volume, see ED578177.]