YOU SAID:

the tall dog ran fast

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背の高い犬が速く走った

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Tallest dog ran fast

INTO JAPANESE

高い犬が速く走った

BACK INTO ENGLISH

The dog ran fast

INTO JAPANESE

犬はとても速く走った

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The dog ran so fast

INTO JAPANESE

犬はとても速く走った

BACK INTO ENGLISH

The dog ran so fast