`11` cheaper

`12` the greatest

`13` better

`14` the cheapest

`15` more boring

`16` more comfortable `-` the most comfortable

`17` the funniest

`18` older

`19` the smallest

`20` the largest

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

`***` So sánh hơn với tính từ

`-` Ngắn: S1 + be + adj-er + than + S2

`-` Dài: S1 + be + more adj + than + S2

`***` So sánh hơn nhất với tính từ

`-` Ngắn: S + be + the + adj-est

`-` Dài: S + be + the most + adj

`->` Tính từ có một hoặc hai âm tiết `->` adj+er

`->` Tính từ có hai âm tiết trở lên `->` more + adj 

 `***` Trường hợp đặc biệt

`1`. good/well `->` better `->` the best

`2`. bad/badly `->` worse `->` the worst

`3`. many/much `->` more `->` the most

`4`. little `->` less `->` the least

`5`. old `->` older/elder `->` the oldest/eldest

`6`. far `->` farther/further `->` the farthest/furthest

...

`11.`

$\text{Form:}$

`+)` S1 + be + adj-er/more adj + than + S2

cheap `=>` cheaper

`12.`

$\text{Form:}$

`+)` the + adj-est/most adj

great `=>` the greatest

`13.`

$\text{Form:}$

`+)` adj + N

`+)` adj-er/more adj + N

good `=>` better

`14.`

$\text{Form:}$

`+)` the + adj -est/most adj

cheap `=>` cheapest

`15.`

$\text{Form:}$

`+)` much more + adj

boring `=>` more boring

`16.`

$\text{Form:}$

`+)` S + be + adj-er/more adj + than + S2

`+)` the adj-est/most adj

comfortable `=>` more comfortable

comfortable `=>` the most comfortable

`17.`

$\text{Form:}$

`+)` the + adj-est/most adj

`+)` adj + N

funny `=>` the funniest

`18.`

$\text{Form:}$

`+)` be + adj

`+)` S + be + adj-er/more adj + than + S2

old `=>` older

`19.`

$\text{Form:}$

`+)` the + adj-est/most adj

small `=>` the smallest

`20.` 

$\text{Form:}$

`+)` the + adj-est/most adj

large `=>` the largest