1. They could go anywhere they wished. (could, 能够)
2. You shouldn’t go on those ships. (shouldn’t, 不应该)
3. There won’t be any other foreigners. (won’t, 将不)
4. We just had to show our passports. (had to, 不得不)
5. We could see the sun setting behind the white pagoda. (could, 能够)
