Hey, how do I download it?
This is a warmer, and there is nothing to download. It's just an idea for your lesson, not a worksheet.
Select five or six 'Be careful ...' warning sentences, e.g. 'If you eat that, it'll poison you'. Ask students to decide where the main stresses are in each sentence. Then offer a strong model of intonation for giving warnings. Get students to experiment saying these in pairs, then stand up and mingle (walk around meeting others). Every time they meet another learner, they give a warning. (If it works, it'll be noisy!)
When they've had enough, ask learners to write new warnings they could give people. When ready, repeat the mingling activity.