Yes, I understood.
Example: Did you understand what I said? Answer: Yes, I understood.
Yes, I understood. Example: Did you understand what I said? Answer: Yes, I understood.
Ja, ich habe verstanden. 
Ja, jag förstod. 
Ja, jeg forstod. 
Ja, jeg forsto det. 
Já, ég skildi. 
Jah, ma sain aru. 
Taip, aš supratau. 
Jā, es sapratu. 
Kyllä, ymmärsin.