When you’re talking about the possibility of something happening in the future, use can if something is very likely to happen. Could, on the other hand, should be used for things that have an equal chance of not happening.
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The meaning of COULD is —used in auxiliary function in the past, in the past conditional, and as an alternative to can suggesting less force or certainty or as a polite form in the present. How to use could in a sentence.
When I was younger I could stay up all night and not get tired. It was so noisy that we couldn't hear ourselves speak. You said we could watch TV when we finished our homework. We asked if the computer could access the internet. She walked off before I could say anything.
We use could to show that something is possible, but not certain: They could come by car. (= Maybe they will come by car.) They could be at home. (= Maybe they are at home.) We use can to make general statements about what is possible: It can be very cold here in winter. (= It is sometimes very cold here in winter.)
You use could when you are expressing strong feelings about something by saying that you feel as if you want to do the thing mentioned, although you do not do it.