could

Before I was blind, I could see very well.

I think he could do it if he really wanted to.

Could I borrow your coat?

Could you proofread this email?

Even without hovering drones, a lurking assassin, a thumping score and a denouement, the real-life story of Edward Snowden, a rogue spy on the run, could be straight out of the cinema. But, as with Hollywood, the subplots and exotic locations may distract from the real message: America’s discomfort and its foes’ glee.

You could try adding more salt to the soup.

I haven't could sleep.