The verb estar is used in #6 above because it indicates a temporary or changing state. In this case, the speaker is describing the condition of being tired, which can vary from time to time.
The verb "estar" is used in sentence #6 because it refers to the temporary state or condition of the subject. In this case, the subject is "tú" and the verb "estás" is used to indicate that "you" are currently in a state of being sick. Unlike the verb "ser," which is used for permanent or inherent characteristics, "estar" is used to express temporary conditions or locations. In this context, the verb "estar" accurately reflects the changeable nature of being sick, as it is not a permanent characteristic.
The verb "estar" is used in #6 above because it indicates a temporary state or condition. In Spanish, the verb "estar" is generally used to express emotions, locations, and temporary states. In this case, the sentence "Ellos están en la clase de español" translates to "They are in the Spanish class." Here, the verb "estar" is used to talk about their current location, which is a temporary state. If we were to use the verb "ser" instead, it would imply a more permanent characteristic or identity of the subject. So, when you want to talk about someone's location or temporary state, you would use the verb "estar" in Spanish.
