Basic Vs. Advance English 1. I'm not sure - I'm on the fence 2. I'm very happy - I'm over the moon 3. I'm very tired - I'm exhausted 4. I don't understand - I'm lost 5. I'm very surprised - I'm blown away 6. I'm leaving now - I'm taking off 7. I'll see you later - I'll catch you later 8. I'm very angry - I'm fuming 9. I'm very excited - I'm thrilled