Why was "Anak kalian...." marked wrong?
Because children is a plural. Anak is singular, anak-anak is plural.
Why is anak anakmu marked wrong?
it should be accepted tho, since "your" doesn't really give a hint to whether it is singular you or plural you. report it.
why is dinilai wrong?
Only one anak was supplied.. i could not use 2
Dinilai = dianggap
DuoLingo can be very frustrating when they contradict themselves.
Why kalian not kamu ?