C'est son huitième voyage.

From Lesson 231:Ordinal numbers·French

Questions & Answers about C'est son huitième voyage.

Why use c'est here instead of il est?
In French, when you introduce or identify a noun that has a determiner (like son, un, or le) in front of it, you must use c'est. You only use il est or elle est when followed directly by an adjective with no article.
Could son also mean "her" eighth trip?
Yes! Possessive adjectives in French agree with the noun being owned, not the owner. Since voyage is masculine, you must use son whether the trip belongs to a man or a woman. The broader context of the conversation would clarify if it means "his" or "her".
Is there a liaison between son and huitième?
No, you do not pronounce the "n" sound to connect the two words. The word huit (and its derivatives like huitième) starts with an "aspirated h." This means it acts like a consonant, preventing both liaisons and contractions (elisions) from occurring right before it.
Do ordinal numbers like huitième always go before the noun?
Yes. While most descriptive adjectives in French come after the noun, ordinal numbers (such as first, second, or eighth) are an exception and are always placed before the noun they modify, just like in English.

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