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"For those interested in flower arrangement" can be considered a contraction of "For those (people) (who are) interested in flower arrangement".
For those interested in flower arrangement, ...
→ For those (who are) interested in flower arrangement, ...
→ For those (people) (who are) interested in flower arrangement, ...
❌ for they people (who are) interested, ...
❌ for their people (who are) interested, ...
❌ for them people (who are) interested, ...
〇 for those people (who are) interested, ...
"them" can be used if it stands alone:
〇 Some people have expressed an interest in flower arrangement. For them, Maya Li will be providing...
コメントありがとうございます!
interestedの前にwho are または people who are が省略されていてthemだけがそれらを修飾することができるのですね!ありがとうございました。