I have multilingual page,but the default language does not have the pathe /en/

I need to add path prefix /en/ to the default language (english)

I need to see like this for all languages on the same website:
site:xxxx.com/en/
site:xxxx.com/es/
site:xxxx.com/ro/
site:xxxx.com/it/

In this way the pagerank will be distributed equally for all my languages.
Thanks.