Select all that apply: which sentences follow the ability-form rules for modals and be able to?
From our balcony, we could hear the harbour bell every evening.✓Richtige Antwort
I can to distinguish the twins only when they speak.
After hours of searching, the crew could locate the missing beacon at dawn; they found it and brought it back.
Ruth hopes to be able to carve stone after her apprenticeship.✓Richtige Antwort
Erklärung
The balcony sentence correctly uses could for repeated past perception, and the apprenticeship sentence supplies the infinitive form with be able to. Can to distinguish is malformed, while the beacon was explicitly found and brought back, making could locate unsuitable for that completed one-off achievement.