The pronoun en is usually described in the literature as an adverbial pronoun, although the adverbial value is only one of several functions in which it can appear. It is a pronoun whose use is very diverse and complex, which is best seen based on numerous syntactic functions that we will present first in this paper. Then we will emphasize the analysis of examples of its use in the corpus, which includes student works divided into three stages (PI / INT / AH). Our goal is to determine to what extent this pronoun is represented in the mentioned corpus and in which syntactic functions it appears most often, i.e., to what extent students master its use. The analysis will also include those examples in which the use of this pronoun was absent as well as those in which its use is unacceptable.