The adverb 俩 "both"
俩 is used to talk about two people.
The adverb 俩 
is used in colloquial speech. In a sentence, it is placed after the subject and before the predicate.
is used in colloquial speech. In a sentence, it is placed after the subject and before the predicate. Pay attention
都 is often added after 俩.
is often added after 俩.Scheme
subject
俩
(都)
predicate
Examples
我们俩是兄弟
We two are brothers
wǒmen liǎ shì xiōngdì
咱们俩都知道
We both know it
zánmen liǎ dōu zhīdao
Sometimes 俩 can be used as a classifier “two” when placed before a complement.
Pay attention
It cannot be followed by a classifier.
Scheme
subject
predicate
俩
complement
Examples
她爸爸有俩孩子
Her father has two children
tā bàba yǒu liǎ háizi