Could can be used in several situations.Some of them are
- Heavy rains could cause the road damage.
- Heavy consumption of cigarette could cause cancer.
- Why did you do that? It could have broken your legs.
- You could have called me first.
- Due to hectic schedule,I couldn’t make it happen.
- I could play football when I was 18 years old.
- Yesterday,I couldn’t eat full meal .
- You could have spent your time in new York.
- We could take a auto because it’s too far.
- We could go to a movie if all are interested.
- You could have taken Cappuccino .
- Could I have something to drink?
- Couldn’t you help me with this for just a minute?
- Couldn’t he thinks about you?
- Could you please help me out?
- Could I take this Friday off?
- Could I take your pencil?
- Could I use your laptop for sometime?
- Could I take advantage over her?
It also used to tell something that has no possibility .
Janvir couldn’t have seen him .