.htaccess重写index.php和pages.php？page = value到.html

I'm trying to figure out how i can redirect my index.php to index.html and also my pages.php?page=value to value.html I can make it one by one but i can't do it together

Could you please help me to solve this? I'm new in .htaccess

Here what i've tried:

Options +FollowSymLinks 
RewriteEngine On
RewriteRule ^([^/]*)\.html$ pages.php?page=$1 [L]
RewriteRule ^(.*)\.html$ $1.php [NC]

Thanks in advance!