Why did people stop saying „thou“?

German has Sie and du, French has vous and tu, Spanish has usted and tú, and modern English has… you.

But this was not always the case. In the 15th century, you was used in a similar way to the German Sie. The equivalent of the German du was the English thou (and thee for dir), words that will be familiar to anyone who has read Shakespeare in the original English. So to say English has no Sie form is not totally correct – more historically accurate would be to say English has only a Sie form. See more below: