To form the superlative of short adjectives, we add -est or -st.
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Adjective
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Superlative
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long
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longest
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small
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smallest
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high
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highest
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short
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shortest
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deep
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deepest
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slow
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slowest
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Adjective ending
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Example
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Add
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Superlative adjective
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-e
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wide
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+ -st
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widest
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consonant + vowel
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big
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double the final
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biggest
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+ consonant
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consonant + -est
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The always goes before a superlative.
Dad is the tallest. The yellow car is the fastest.
Note that we can say in the world with superlative adjectives.
Which is the highest mountain in the world?
The river Amazon is the longest river in the world.
