`49.` Do the ethnic minorities in Vietnam often live in mountainous areas ?

`50.` Are their costumes colorful and unique ?

`51.` Do they often gather together at the communal house on special occasions ?

`52.` Do ethnic people often hold festivals in spring ?

`53.` Is life in the mountainous areas quite difficult because of the extreme weather ?

`@` HTĐ :

`-` Be :

(+) S + am/ is/ are + N/ Adj

(-) S + am/ is/ are + not + N/ Adj

(?) Am/ Is/ Are + S + N/ Adj? 

`***` Wh - word + am/ is/ are + S +…?

`*` He/she/it/N số ít : is

`*` You/we/they/N số nhiều : are

`*` I : am

`-` V :  

(+) S + V_s/es/inf

(-) S + do/ does + not + V_inf 

(?) Do/ Does + S + V_inf +…?

`***` Wh - word + do/ does + S + V_inf +…?

`*` He/she/it/N số ít : does/ doesn't

`*` I/You/we/they/N số nhiều : do/ don't

`54.` unhealthily

`@` So sánh hơn :

`-` Với adv ngắn : S + V + adv_er + than + N

`-` Với adv dài : S + V + more + adv + than + N

`55.` communal

`@` mạo từ + adj + N

`-` communal (adj) : chung, thuộc về cộng đồng

`56.` mountainous

`@` be + adj

`-` mountainous (adj) : nhiều núi, có địa hình núi

`57.` traditionally

`@` V + adv

`-` traditionally (adv) : theo truyền thống

`58.` interested

`@` be interested in + N/V-ing

`-` interested : cảm thấy thích thú, quan tâm đến