You shall not add t to an adjective when the noun it is describing is a n-word.

A n-word is when the article of a noun is ‘en’ = common gender.

You SHALL add t to an adjective when the noun it is describing is a t-word.

A t-word is when the article of a noun is ‘et’ = neuter gender.

Plural forms + definite singular end on e.

Examples:

en stor bil

et stort hus

2 store biler

2 store huse

den store bil

det store hus

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