could

‘can’ and ‘could’ You are here ‘can’ and ‘could’ Level: beginner Possibility and impossibility We use could to show that something is possible , but not certain: They

could

Level: beginner

Can I ask a question, please?
Can we go home now?

Could
The miserable initial effects of tear gas — including stinging in the eyes and throat — typically lasts for only 15 to 30 minutes after a person who has been exposed gets to an area with cleaner air. But many of the illnesses in the Army research surfaced days after exposure. Researchers cautioned that illnesses were not lab-checked, and could have been caused by damage to the respiratory tract rather than infection, or could have been prompted by other factors.
The use of tear gas to disperse protesters has been the subject of criticism from organizations such as the American Civil Liberties Union.

Could
But she was also a determined autograph hunter with a flair for seeking out society’s rebels, risk takers, and even despots for her unusual collection.
Among the letter-writers and signatures that wound their way back to her country mailbox were Richard Nixon, Lord Mountbatten, Sir Charles Kingsford Smith, Neville Chamberlain, Helen Keller, and Dame Enid Lyons.

Could
Nathaniel Hackett was asked 1ВЅ weeks ago about whether Love could be used in the offense right away in a gadget role. His response: “Everything is still so early to tell. I haven’t even really gotten to sit in a meeting room at Lambeau. I haven’t gotten to talk with him much or work face to face. There’s so much yet to be seen. You never know. Anything can happen.” Those last three words led to an inordinate amount of Love gadget stories, despite the fact this quote literally could apply to the Packers creating a package for me next year.
I’ve always felt Lane Taylor is too valuable to release or even trade because he’s an established veteran who can play tackle in a pinch. It’s a solid insurance policy for a deep offensive line and the restructure gives Taylor security during uncertain times to work back from a devastating injury. It’s the best outcome for both sides.

Could
Police have arrested two opposition candidates in recent days, but Mr Lukashenko is being careful not to alienate the West amid human rights abuse claims.
The slipper has become a symbol of the protest movement, which hopes to topple Mr Lukashenko after 26 years in power. According to the movement, the president represents a cockroach and the footwear a weapon to “squash” him with.

References:

http://www.nytimes.com/2020/06/03/us/tear-gas-risks-protests-coronavirus.html
http://www.abc.net.au/news/2020-06-03/autograph-hunter-lynda-williams-could-track-down-almost-anyone/12307202
http://www.packers.com/news/inbox-i-wish-we-all-could-have-been-in-that-meeting
http://news.sky.com/story/belarus-protesters-wave-slippers-as-they-queue-up-to-defy-president-lukashenko-in-upcoming-election-11999319
http://support.office.com/en-us/article/add-a-cover-page-79df80ec-266d-46d6-9382-6d70f1d13777