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. It was so noisy that we couldn't hear ourselves speak. (= maybe they will come by car.) they could be at home.
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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. When i was younger i could stay up all night and not get tired. You said we could watch tv.
We use could to show that something is possible, but not certain:
They could come by car. To form the negative of be able to, you either put not or another negative word in front of able, or you. The negative form of could is could not or couldn't.
