(Şu/Şunlar) in turkish are similar to (Das) in german, and (Bu/Bunlar) are similar to (Dies) , but turkish (just like English) diffrentiate Das (for singular) from Das (for plural) ...
In other words, you can say:
Bu= This = Dies (ist)
Bunlar = These = Dies (sind)
Şu = That = Das (ist)
Şunlar = Those = Das (sind)
I hope that my comment was helpful
Not that much you just have to look closely and understand it anyone who is having trouble just study it a little more and you will get it some times it just takes more time for others to get it dome people like me learn it fast and reconize it when they see it it took me a 1 lesson to reconize it my friend took 1 week to solve it so its ok if you dont know just study a little bit more and then you will get it ;)