Bonjour
Il n'est pas dans son assiette.
Son is a determinant , possessive adjective.
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There are =>
a-the articles determinants
indefinite = un, une, des
definite = le, la, les
partitive = du, de la, de l', des
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b-the adjectives determinants
demonstrative = ce, cet, cette, ces
possessive = mon, ma, mes, ton, ta, tes, son, sa, ses ....
numerical = un, deux, trois .........
and a few more ....
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Hope this helps ☺☺☺