How to call subfolder files through htaccess in my site?

i have one example site.
In the home page it display two languages to view the site,by default it is in English. If we select other language,that language php files are in other directory(EX: french) in the site home directory(public_html).
Now in this sub-directory .htaccess file is there to redirect the php files.
The problem is how to call/write the rewrite rule in htaccess file to identify the specific file and rewrite them.

Give me the help regarding the rewrite rule.

Thank you,in advance.

It will redirect all file.html to french/file.html

Make sure the names under french dir are same as under public_html

RewriteEngine On
RewriteBase /
RewriteRule (.*) french/$1 - [L]

Note: the base is the home directory (usually public_html or www). So any URL would be redirected to /french/ directory (this is also treated as from base, not relative to the directory where htaccess is).

Making it more precise

RewriteBase /
RewriteRule ^(.+)$ french/$1 - [L]

You get problems, debug it using the tips provided at this on [URL=“http://www.expertsguide.info/2010/08/use-htaccess-to-rewriteredirect-requests/”]debugging htaccess.