Mr Koh, a Chinese, was born in the UK and studied there.
Can I call him a native speaker? And why?
Thanks.
A native speaker of Chinese or English?
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tamguatlaya Chinese,
This looks incomplete. It would be better to write a Chinese person.
It's always "native speaker of {language}".
Everybody is a native speaker of some language unless they are unable to speak at all.
As for where Mr Koh was born, that is irrelevant. If he learned his first language from his Chinese parents and relatives, and that language is Chinese, and he learned English later and now speaks it poorly with a strong Chinese accent, then he is a na