Thanks all!
You can use the one country pass in your own country, but only twice (one time to left and one time to return) look, this is a copy of the official site:
german:
Mit einem Interrail Global Pass kannst du an einem Reisetag aus deinem Wohnsitzland ausreisen (Hinfahrt) und an einem Reisetag zurückreisen (Rückfahrt). Diese Fahrten in deinem Land sind an beliebigen Reisetagen möglich, an denen dein Pass gültig ist. Hier findest du weitere Infos zu Reisen in deinem eigenen Land.
english:
If you have an Interrail Global Pass, you can travel on one travel day to leave your country of residence (outbound) and on one travel day to return (inbound). You can use these journeys in your country during travel days at any point in your Pass’ validity. Read more about travel in your own country.
I want to take a France rail pass (because my country of residence is Germany) to go to my family and then return to France to work You know what I mean now?