Why in the following example is ser used? I thought that the estar form would be used because cheerful is a an emotion or feeling. Wouldn't this indicate that the group is "always cheerful"?
Ustedes ________ muy alegres.
In this sentence what they mean is that they are happy people, meaning they have that sort of character, as an essential characteristic in them.
If we want to say that they are feeling that happiness at the moment of speaking then we use estar:
Ustedes están muy alegres.
In this case, we are talking about how they feel then because something nice is happening, they are maybe at a party or they just won the lottery, etc...
I hope this clarified it.
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