slimness and weight are NOT permanent things. Sus padres estan bastante delgado ya, pero en seis meses tal vez estaran gordos. No?
You can talk about physical condition in a permanent way or non-permanent way. For example, if you say someone is slim, as in he/she has always been a slim person you would use "ser":
María es muy delgada. (this characteristic is seen as a permanent one)
But you can also use "estar" if you are talking about a sudden change or non-permanent characteristic, as if it was a result of something. For example:
María está muy delgada. (this implies she has probably gone on a diet and she is now slimmer)
Another typical example is with ser/estar guapo/-a.
Antonio, eres un chico muy guapo. ( permanent)
Antonio, estás muy guapo hoy. Ese peinado te sienta bien. (non-permanent/result)
Here is a lesson about this use of estar:
Using estar (not ser) when talking about physical condition of something, someone or a place
Hope it helps
I had a similar question to Garry. slimness and weight are NOT permanent things, how come for the question ,
Sus padres son bastante delgado, están cannot replace son??
Erika, exactly! There's no indication that the slimness was arrived at over a period of time or whether the comment was on the genetic slimness that exists in the family. Nevertheless, the instructor's point is taken even though the question was poorly posed.
I think the point in using a conjugation of ser is you are saying it is a more long term, on going, always there thing; not something that just happened. But with estar, you are expressing a change has occurred. The use of the different verb states the context for you. Describing a person a, *Juan es delgado* is telling you Juan has always been thin, even if that could change in six months, you are implying this describes how he usually is.
If I lose a lot of weight, I would say *Estoy delgado ahora* because I have not always been thin. But I would say, *No soy alto, soy bajo.* Because I have always been short and am not going to change that.
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