("To be" is the really common verb that lets us say that "he is in the hot air balloon", or "they are fantastic socks", or "I am a snappy dresser".)
The two forms of "to be" in Spanish are Ser and Estar.
I'll explain when to use each one in a moment, but first let's see what they look like. Here's how to say "I am...", "you are...", "they are..." etc, using both ser and estar.
When to use "ser"
You'll use words from the "ser" column when you're talking about permanent states or characteristics.
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Our girl María is smart. Not just today, but all the time. So we use ser, because we're talking about a permanent characteristic.
Likewise, Jose is going to stay an architect, I'm going to continue to be tall, and I will always be brothers with my brother. So in all these cases you would use ser
But when I'm talking about my friend who is in the hot air balloon (a distinctly non-permanent situation) I would use estar instead.
When to use "estar"
Estar (and its various forms) is used when talking about something that is a non-permanent state or location.
All of these situations are not permanent states or characteristics, so we use estar. Maria has been well in the past and will hopefully get better, so that's not permanent. Juan isn't nailed to his floorboards, so that's not permanent either.
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In particular, you would always use estar when you're talking about someone being at a particular location — since people can and do move around!
If you use ser, then Maria is a pretty girl in general. If you use estar, it might be because she's dressed up for a party. One is a permanent characteristic, and the other is a temporary state.
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