Can I say "more than their worth" instead of "more than they're worth"?
No, you cannot say "more than their worth" here. This is because "their" is only used to indicate possession or show belonging. In contrast, "they're" is a contraction of "they are". So it would only be grammatically correct to say "more than they're worth" here. Ex: It's their puppy. Ex: They're so tall!
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