Sentence stems bluff

Give students three to five sentence stems with a mix of Present Perfect Simple and Continuous, e.g. “I have never_________________”, “I’ve been________________ ing recently” and “I haven’t ______________yet”. Ask them to fill one sentence with a lie and the other ones with something true. They then read out their sentences and their partner tries to guess which one is false, perhaps after asking additional questions (to which they can still lie when answering)