$\circ$ S + should + V-inf: nên

$\circ$ S + shouldn't + V-inf: không nên

`---------`

`1.` Tony has a toothache

`-` Should: 

`+` He should see the dentist.

`+` He should brush his teeth twice a day.

`-` Shouldn't

`+` He shouldn't eat too many candies.

`+` He shouldn't eat too much.

`2.` Quan has a bad cold

`-` Should:

`+` He should take some aspirins.

`+` He should eat a lot of fruits and vegetables.

`+` He should see a doctor.

`-` Shouldn't:

`+` He shouldn't take a hot bath.

`+` He shouldn't drink cold water.

`+` He shouldn't stay up late.

`3.` Phong has a stomachache

`-` Should:

`+` He should see the doctor.

`+` He should eat healthy foods.

`+` He should wash his hands before having meals.

`-` Shouldn't

`+` He shouldn't eat too much.

`+` He shouldn't drink coffee.

`4.` Phong has a sore throat.

`-` Should:

`+` He should see a doctor.

`+` He should eat a lot of fruits and vegetables.

`-` Shouldn't:

`+` He shouldn't drink cold water.

`+` He shouldn't drink coffee.

`----------------`

$\textit{#NhatHuyThichChoiLiqi}$
$\text{~ Chúc b học tốt ạ ~}$