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pablo te voy a poner los ejemplos de comparativos con todos los adjetivos que mencionas y despues los superlativos:

comparativos:

A volkswagen is slower than a Ferrari (un vocho es mas lento que un Ferrari)

I am more clever/cleverer than my sister ( yo soy mas inteligente que mi hermana)

My English Teacher is more intelligent than my math Teacher (mi maestr@ de ingles es mas inteligente que mi maestr@ de matematicas)

Shakira is more beautiful than Salma Hayek (shakira es mas hermosa que salma hayek)

superlativos:

The snail is the slowest animal on earth (el caracol es el animal mas lento en la tierra)

He is the most clever/the cleverest student in my class ( el es el alumno mas inteligente en mi clase)

the dolphins are tne most intelligent animals on earth (los delfines son los animales mas inteligentes en la tierra)

britney spears is the most beautiful singer in the show bussiness ( britney spears es la cantante mas hermosa del medio artistico)

espero que te sirvan estos ejemplos!!!!!!!!!!!!!

Comparativos

My car is slower than yours. He is more clever yhan his dad . I am more nteligent than you. I am more beautiful than my sister.

Superlatives

This is the slowest bike I have had

Newton was the most intelligent man in the world

Harry is the most clever boy I know

I am the most beautiful girl in the contest

Comparativo:

My dog is more clever than yours. [Clever son dos sílabas, así que no se puede agregar el sufijo -er]

I think the car is slower during rainy days.

Superlativo:

Anna is the most intelligent girl in her class.

The most beautiful flower is the red camelia.

Comparativo: Peter is Cleverer than John

A truck (camion) is solwer than a plane

Superlativo:

Bill Gates is the most intelligent man in the world

My girlfriend is the most beautiful girl in my country