*3 C1-level phrasal verbs*: 1. *Brush up on* – to improve your knowledge or skill in something *Example:* I need to brush up on my Spanish before the trip. 2. *Follow through (on)* – to complete something that you started *Example:* He always has good ideas but rarely follows through on them. 3. *Come down to* – to be the main or most important result or reason *Example:* In the end, it all comes down to trust.