 10. English Phrases for Saying Someone is an Expert from EspressoEnglish.net 1. She was born to dance. Use the phrase was born to, often with athletic or artistic activities, to say that the activity is perfect for the person's abilities and life purpose. 2. He's a natural. Use this phrase to say that a person has natural ability to do something well and doesn't need much help or teaching. 3. She could do it in her sleep. She could do it with her eyes closed. Use this phrase when someone is so good, so well-practiced at an activity that they can do it automatically without using much thought or effort. 4. He knows it inside out. He knows all the ins and outs. Both of these expressions mean that a person has detailed, comprehensive knowledge of a particular topic, activity, or area. 5. She knows the city like the back of her hand. If you know a place like the back of your hand, it means you know the place extremely well. 6. She's a walking encyclopedia of theology. Use this phrase to describe a person who knows a lot of facts about a topic. This is often used for academic areas of study. 7. He's in a class of his own. He's in a class by himself. These phrases don't mean that a person is alone in a classroom. Instead, they mean that the person is so good that no one can compare to him. 8. He's the best in the business. Use this phrase to describe a professional who is excellent at their job. 9. She's quite gifted. This phrase describes someone who is intelligent, especially a child whose intelligence is higher than average. 10. He's a math whiz. Describing a person as a whiz in a particular topic means the person is very good at that topic. Thanks for watching English Tips from Espresso English. If you liked this video, please share it.