BEING WORRIED - AUDIO REFERENCES INFORMAL 1. I'm worried about... 2. I'm afraid... 3. I'm really nervous. 4. I'm scared that... 5. I'm so worried. FORMAL 6. I can't help thinking... 7. I've been worried sick about... 8. I can't stop thinking about it. 9. It's been keeping me awake at night. 10. I've got butterflies in my stomach.