Final answer:
Using 'seguir' with a past participle implies a continuous action from the past to the present, while 'estar' with a past participle indicates a completed action.
Step-by-step explanation:
When seguir is used instead of estar with a past participle, it is expressing a continued action that started in the past and is still ongoing in the present. In contrast, estar followed by a past participle often describes a state resulting from a completed action.
For example, 'La tienda sigue cerrada' (The shop continues to be closed) implies that the shop was closed before and remains closed now, whereas 'La tienda está cerrada' (The shop is closed) simply states the current condition without the connotation of continuity.
When seguir is used instead of estar with a past participle, it is expressing continuation or ongoing action. This usage indicates that the action expressed by the past participle is still happening or ongoing. For example, 'seguir cantando' means 'to keep singing' or 'to continue singing'.