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Hi susan,

1.He is a doctor, but he is not kind.

2.He is poor, but he is happy.

3.She is naughty, but she is not happy.

4.Is she very powerful?
No, she's not, but she is really quick.

1.The sentences above are all from my book. Does 'yet' sound natural if I use it instead of 'but' here?

2.Is 'yet' always uesed in formal context when meaning 'in spite of'?

Thank you very much for your comment.