The Turkish term "sen, siz" matches the English term "thou"

other turkish words that include "sen," : english :
sen, siz ye
sen, siz you
Written Turkish Language
Before 1932, less than half of Turkish words were used in written form. Since 1932, the percentage of Turkish words has jumped from 40 percent to between 75 and 80 percent. The Turkish Language Association started to reform the language after 1932 and its goal was to remove the loan words that had entered into the written languages from the Persian and Arabic languages. Despite not having a lot of written words until the 20th century, written Turkish has been found on Stone Monuments dating back to 725 AD in Central Asia and Mongolia.
Turkish is a Concise Language
In some languages, it takes quite a few words to express something. But in Turkish, it actually doesn’t take that many at all. Just one word might have multiple endings, suffixes, and affixes. This one word can then be used to form the basis of other words.
Did You Hear the One About…?
In Turkish, there are many jokes about Temel, his wife Fatima, and their friend Dursun. So if you’re learning the language, don’t be surprised if you hear about them in a variety of contexts from wisdom to political issues.