could hear
Tom dijo que podía oír a Mary y John discutiendo.
Tom said he could hear Mary and John arguing.
Tom no podía oír a Mary.
Tom couldn't hear Mary.
Tom podía oír a Mary cantando en su dormitorio.
Tom could hear Mary singing in her bedroom.
Tom podía oír a Mary, pero no podía verla.
Tom could hear Mary, but he couldn't see her.