Learn Spanish (Latin America): ¡Cómo duele cuando el contorno está siendo sombreado! - How it hurts when the outline is being shaded!

está siendo sombreado is the progressive analytical passive. We use es sombreado for general facts or routines ("it is shaded"), but we add the progressive element (está siendo) to emphasize that the action is happening to the subject right at this exact moment. It perfectly captures the ongoing pain the speaker is feeling.

In está siendo sombreado, does the word sombreado change if the subject changes?

Yes. In the analytical passive voice (ser + past participle), the past participle acts like an adjective. This means it must agree in gender and number with the subject receiving the action. Since el contorno (the outline) is masculine and singular, sombreado ends in -o. If the subject were la línea (the line), it would be está siendo sombreada. This is different from the perfect tenses (like ha sombreado), where the participle never changes.

Could I use the passive se here and say se está sombreando?

Yes! cuando el contorno se está sombreando is a perfectly natural and very common alternative. However, the analytical passive used here (está siendo sombreado) is great for putting a spotlight squarely on the receiver of the action and the feeling of something being done to it, which fits the dramatic tone of the sentence.

Why does Cómo have an accent mark here if it's not a question?