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Does this sentence sound natural to you native speakers?
・When you write something, you need to be effective.

・You need to be effective in writing.
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Hi,
Does this sentence sound natural to you native speakers?

・When you write something, you need to be effective.

・You need to be effective in writing.

It wouldn't surprise me to hear or read such sentences, if that's what you mean by 'natural'.

But I prefer 'You need to write effectively'.

Clive
Comments  
OK, so it doesn't  sound 'wrong', at least. Good.
Thanks, Clive!