<p>Write them and then forget about them for about a week. Then reread it and you automatically sense errors and know what parts need tweaking. This especially is effective in toying with your usage of tone since you'll be reviewing it much more objectively. Hope this helps, it really worked for me.</p>
<p>That's good. It's also good to read them aloud to yourself. Then you can hear all the awkward sentences and phrasing.</p>