Can't override tag/category/archive php into my childtheme

Hi everybody,
I’m having problems overriding tag.php, category.php and archive.php into my childtheme.I’m using the skeleton theme and in the templete they say:”if you want to overload this in a child theme then include a file
* called loop-tag.php and that will be used instead.”
That’s what I’ve been doing, but it won’t work. Instead it’s like the theme is looping the loop. I don’t know what I’m doing wrong.

Please help!

Ellen