The teacher-controlled task should require students to examine data you prepared (i.e. searched for and incorporated) in order to complete the task e.g. gap-fill using clues from a concordance, guides examination of concordance lines, note-taking, multiple-choice, error correction, etc. In other words, students are not required to perform any kind of search on Sketch Engine themselves. Your data can either be on paper (copied & pasted in the tasks) or in a hyperlink (for students to click on).