dōu shén me nián dài le
What decade are you living in?
That's so out-of-date!
都
dōu
all; both; entirely
什
shén
what
么
me
suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc
年
nián
grain
代
dài
to be a substitute for; to act on behalf of; to replace; to substitute
了
le
(completed action marker)
