​Comparisons (比較) +er

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​tall - taller

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​short - shorter

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​smart - smarter

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​cute - cuter

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​Comparisons (比較) + (consonant)er

​big - bigger

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​sad - sadder

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​hot - hotter

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​Comparisons (比較) + ier

busy - busier

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happy - happier

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funny - funnier

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friendly - friendlier

​Sentence patterns

​My dad is thirty years younger than his dad.

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​My hair is long. My sister's hair is shorter.

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​Cats make good pets. They are much friendlier than turtles.

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​Who is taller, you or your dad?

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​Which is bigger, your bedroom or the kitchen?

​Grammar

​I'm taller than my brother.

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​You're cuter than his sister.

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​He is bigger than my best friend.

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​​They're taller than me/him/her/us/them.

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​My dog is friendlier than your dog.