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Questions & Answers about La costura está rota.
Why do we use está instead of es in this sentence?
We use está because rota describes a physical state or condition that resulted from an action. When a past participle is used as an adjective to describe a resulting state, it always goes with the verb estar.
Why is the word for broken rota and not rompida?
The verb romper (to break) has an irregular past participle: roto. Because it is acting as an adjective describing the feminine singular noun la costura, it changes its ending to match, becoming rota.