GOOD AT is used when talking about activities or areas of expertise:
- I’m good at Maths.
- My sister is good at tennis.
- Dinosaurs aren’t good at tying their shoelaces.
- Hulk isn’t good at expressing himself when he’s angry.
- Einstein was good at Physics.
GOOD WITH is used when talking about people or specific objects:
- I’m not good with children. I don’t know how to play with them.
- I’m not good with words. I don’t know how to express myself.
- Tom’s an accountant, but he’s not good with numbers.
- If you want to be a zookeeper, you have to be good with animals.
- Are you good with computers?
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