in japanese...dai 4 ka

Right so now that we have some basic understanding on how words are formed, lets return to some simplier things..
Greetings!

example 1:
A: Konnichiwa! O genki desu ka?
B: genki desu.

example 2:
*B fell down. A walks to B.
A: Daijobu desu ka?
B: Daijobu desu.

*This is inaccurate, but helps at the beginning of japanese learning.
when you are SAYING something, end with desu. <like a full stop>
when you are ASKING something, end with desu ka? <like question mark>