"He’s such a kind boy." in French

C’est un si gentil garçon.

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Literal Breakdown

English	French	Learn
this is; it is	c’est	Learn
a (masculine)	un	Learn
so	si	Learn
kind; nice (masculine singular)	gentil	Learn
boy	garçon	Learn

The French translation for “He’s such a kind boy.” is C’est un si gentil garçon.. The French, C’est un si gentil garçon., can be broken down into 5 parts:"this is; it is" (c’est), "a (masculine)" (un), "so" (si), "kind; nice (masculine singular)" (gentil) and "boy" (garçon).