I was wondering if in your example for cette aventure etait amusante why are you using cette? The rules state that if a noun starting with a vowel for masculine nouns you use cet. Or is it because aventure is a feminine noun?
As Jim stated, "cette" is used for nouns that are feminine and/or starting with a vowel "as cette doesn't pose any pronunciation issue!". Therefore, it will be used with words such as "aventure" which is feminine (the adjective "amusante" gives us a clue - it has an -e to mark the feminine gender).
I hope this is helpful.
Bonne journée !
"Cette is used with feminine singular nouns"
Copied and pasted directly from the lesson.
As is the case with all adjectives, they must concur with the noun both in gender and quantity.
Cette is a demonstrative adjective and does not reduce to cet even before a noun starting with a vowel.
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