wouldn't be able to
Я не смогла бы оставить Тома.
I couldn't leave Tom.
Есть такие детали, которые она не смогла бы придумать.
There are details like that she couldn't have made up.
— Дьяволицы (1955)
She wouldn't be able to resist.
Да и не смогла бы она ничего увидеть.
Besides, she wouldn’t have been able to see anything.
— Подними красный фонарь (1991)
Мэри не смогла бы попасть к себе в комнату.
Mary wouldn't have been able to get to her room.
Без него она не смогла бы этого сделать.
She wouldn't have been able to do it without him.