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