Forming the superlative of French adjectives in complex cases

Look at these superlative sentences:

Jean est le garçon le plus mignon de l'école.John is the cutest boy in the school

Jean est le plus mignon garçon de l'école.John is the cutest boy in the school.

Le Texas est l'état le plus riche des États-Unis.Texas is the richest state in America

Le Texas est le plus riche état des États-Unis.Texas is the richest state in America.

The simplest superlative forms are quite similar to the English equivalents, but in more complex examples, the word order and prepositions may be different to what you expect. For example:

Marie est la fille la plus intelligente de la classe. (Marie is the smartest girl in the class.)

Two things to pay attention to in complex examples like this are:

1. la fille usually appears before la plus whereas in English it's the reverse order. Also see that 'la' appears twice.

2. de la / du /des / de l' ('of the') always follows the superlative, even when in English we might say 'in'.

Note: you can also say:

Marie est la plus intelligente fille de la classe. (Marie is the smartest girl in the class.)

See also the related Le/la/les plus and Le/la/les moins = The most and the least (Superlative with Adjectives in French)

Here are other Superlative structures:
Le plus/Le moins = The most/the least (Superlative with Adverbs in French)
Meilleur, mieux, pire / plus mauvais, plus mal = better, best, worse and worst in French (irregular comparatives and superlatives)

And Comparative structures:
Plus... plus..., moins... moins... = the more...the more..., the less...the less... (comparisons with phrases)
Better and better, worse and worse = de mieux en mieux, de pire en pire (Comparisons in French)
De plus en plus / De moins en moins + [adverbe/adjectif/verbe] = more and more / less and less + [adverb/adjective/verb] (Comparisons in French)
De plus en plus de / de moins en moins de + [nom] = more and more / less and less + [nouns] (Comparisons in French)
Plus ... que/Moins ... que/Aussi ... que = More ... than/Less ... than/As ... as (Comparisons with Adjectives in French)
Plus ... que/Moins ... que/Aussi ... que = More ... than/Less ... than/As ... as (Comparisons with Adverbs in French)
Plus que/Moins que/Autant que = More than/Less than/As much as (Comparisons with Verbs in French)
Plus de ... que/Moins de ... que/Autant de ... que = More ... than/Less ... than/As much/many ... as (Comparisons with Nouns in French)

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Examples and resources

Le Texas est le plus riche état des États-Unis.Texas is the richest state in America.
Le Texas est l'état le plus riche des États-Unis.Texas is the richest state in America
Jean est le garçon le plus mignon de l'école.John is the cutest boy in the school
Jean est le plus mignon garçon de l'école.John is the cutest boy in the school.
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