What does going to Australia have to do with you being born and spending your childhood in Hong Kong?Is the following sentence correct and natural?
I haven't been to Australia since I was child and born in Hong Kong.
The part above is grammatical and makes sense. It's a perfectly good sentence on its own.I haven't been to Australia since I was child
This part does not make sense and it's what makes the original sentence ungrammatical and nonsensical.and born in Hong Kong.
In that case your 'since' is misleading - I'd hesitate to say wrong, because it could be justified in a context like this:I have never been to Australia
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