This is the 200th most frequent Ukrainian word.
могли
"Могли" means "could" or "were able to" in English.
The word 'могли' is used here to form a conditional sentence, expressing a hypothetical ability in the past.
Вони могли б допомогти нам, якби були тут.
They could have helped us if they were here.
In this question, 'могли' is used to politely request an action, combining past tense with conditional mood.
Могли б ви пояснити цю тему ще раз?
Could you explain this topic once more?
Here, 'могли' is used to describe an actual ability they had in the specific past event.