"分からない" means "not understand" "です" is the Japanese linking verb. "I don't understand what a bakery is."
Means '..... do/does not understand'. The blank spot is for the subject.
'(This/That/He) is our son'.
'(This/That/He) is my son.'
'(This/That/She) is our mother.'
'(This/That/She) is my mother.'
"Boku no chinko desu" means "my penis" in Japanese.
'(This/That/She) is my older sister.'
'(These/Those/They) are our parents.'
'(This/That/She) is my younger sister.'
"Desu" (pronounced, "dess") sort of means "is". For instance, I could say, "Watashi wa CRiMCO desu", or "My name CRiMCO is".
its should daijoubu..mean fine/okay/alright daijoubu desu ka = are u alright? daijoubu desu = i'm alright