Events could have developed in a dramatically different way.
事情本来可以发展成另一种样子。
Could you give me a bed for the night?
今晚你能给我弄个睡的地方吗？
No one could have foreseen things would turn out this way.
谁都没有预料到事情的结果会这样。
The resources at our disposal could have been better utilized.
我们所掌握的资源本来可以利用得更好，获得更高的效益。
You could tell she was foreign by the way she dressed.
从她的穿着就可以看出她是外国人。