On your WordPress blog the permalink settings allows the SEO URLs. There you can write your own permalink styles. The default style is http://articles.tutorboy.com/?p=123 and other three styles are Day and Post Name, Month and Post Name, Numeric and Finally Custom Structure there. Check the custom structure radio button and try your style over there.

1. To add a prefix to the post name like “blog”, “articles”, “post”, Just use this

/blog/%postname%/

2. To add any file extension to all post URL

/%postname%.html
or
/%postname%.php
or
/%postname%.aspx

3. To add the category name before the post name.

/%category%/%postname%.html

4. To add a user name before the post name.

/%author%/%postname%.html