Помогите пожалуйста с глаголами в английском тексте

Понадобилось решить небольшое задание, но английский последний раз видел лет 15 назад в школе, буду очень признателен, если для кого-то это как семечки щелкать)

Выберите нужную форму модального глагола: can (could), be able to, have to.
It was late autumn. A hungry fox was walking around the forest looking for something to eat, but he (...) find nothing. Then he came up to the lake. "There (...) be some fish", he thought. "If I (...) catch one I shall (...) to have a good dinner. “He saw a few fishes but they were swimming too fast. But the Fox (...) swim. “How (…) I catch them?” he thought and said, “Little fishes!” – “We (…) not hear you.” – “Come nearer, you (…) come on land and live in peace as I do. You (…) always find something to eat in the forest and you will (…) to meet many friends.” – “He (…) be so stupid if he tells us to come on land,” thought the fishes.