Using a corpus of school essays of Swedish students in year 9 and 12 of junior and senior high school, the present study compares the level of formality and frequency of discourse markers in the respective year groups. Based on previous literature, discourse markers found in the essays are categorized as either formal or informal. Ten randomly selected essays from each year group are analyzed. The results show that there are discrepancies between grade 9 and year 12 in both formality and frequency of discourse markers. The differences can be connected to second language acquisition and contexts in which the Swedish students acquire English. Outer input of English, made possible by new technology and globalization, has a significant impact on language acquisition, a phenomenon which is new and relatively unexplored.  The results of the current study are discussed in the light of the relevance and impacts of the frequent exposure to English through internet activities and media consumption and how it effects language learning. By focusing on discourse markers, which make up an important part of written and spoken language, I attempt to point out patterns that may be relevant and useful for English teachers. Awareness of how combined mechanisms effect and develop students´ acquisition and how to interpret differences in how students use specific grammatical elements such as discourse markers may be useful as a pedagogical analyzing tool. Not least when it comes to the assessment of essays.