Show Pages at index.php

Could anyone tell me how can I do this?
You ca not.
Pages are different from posts. They are not part of the chronological stream of posts.

Why would you wan to do that?

Why would you wan to do that?
Simply cause I want! Pages are an important part in my website. If I could assign a custom template and a custom parent page to certain posts, I wouldn’t use pages, but I can’t.
Why can’t I use The Loop to display pages? In search.php, for example, when you search sth which is in a page, the Loop displays it. Shall I hack WordPress, or create a plugin?

How about https://codex.www.ads-software.com/Template_Tags/query_posts#Retrieve_a_Particular_Page

This plugin maybe:
https://www.nathanrice.net/blog/wordpress-single-post-templates/

Also this might interest you:
https://guff.szub.net/2005/07/21/post-templates-by-category/

Mmmm very interesting MichaelH, thank you very much!

Now I have two possibilities: the first one, combining wp_list_pages and query_posts to make a little botch :P, and the second one, writing that important pages as posts and assign them a custom template using the information you provided me. If I chose the second possibility, do you know how could I change the permanlink of these certain posts from /special-post to /project/special-post, for example, maybe using a category?

If using something other than the Default permalink structure you could always edit the permalink in Write->Post.

But you cannot add a slash… :S

Resolved! I can use a category to emulate subdirectories! ??

Thank you very much!