Considering the research question "Are students aware of their errors when writing online using English as a foreign language?", 94 pre-service teachers completed a questionnaire that included simple sentences with common errors for them to identify. In the second part of the questionnaire, they were asked whether they were conscious of these errors and also about the resources they usually employ to clarify their doubts. This has allowed us to verify that most students are aware of those errors, but also that they have doubts and resort to different online resources for clarification. Results suggest that we need to provide our students with resources to help them clarify their doubts. In doing so, we should consider factors such as the influence of online environment and sustained attention in e-learning, which seem to be important when working with the needs of these students.