Breakdown of El médico parece nervioso hoy, pero no lo está.
pero
but
no
no, not
estar
to be (location/state)
hoy
today
Questions & Answers about El médico parece nervioso hoy, pero no lo está.
Why do we need the word lo in the phrase no lo está?
Could I just drop the lo and say pero no está?
Why is it está and not es at the end of the sentence?
The verb must match the type of characteristic being described. Since being nervous today is a temporary state, we use estar. If the sentence were about a permanent trait, like being a nervous person in general, you would use ser. Keep in mind that the pronoun lo is used to replace adjectives for both ser and estar.
Why use parece here instead of se parece?