$\text{1.}$ Lan doesn't swim as fast as I do.

$\text{→}$ ở đây có 2 trợ V: doesn't và do ⇒ Lan doesn't và I do

$\text{→}$ sau trợ V là V ⇒ doesn't swim

$\text{→}$ có as ... as ⇒ as fast as

$\text{2.}$ The people of Viet have the largest number.

$\text{3.}$ Any nomadic child can ride a horse.

$\text{→}$ nomadic: dân du mục ⇒ nomadic child

$\text{→}$ can + V ⇒ can ride

$\text{4.}$ My parents ban me from watching TV too much.

$\text{→}$ ban sb from doing sth: cấm ai làm gì

$\text{5.}$ Farmers depend heavily on the weather.

$\text{→}$ depend on: phụ thuộc vào

$\text{→}$ heavily là adv ⇒ trước nó là V