We use could in a number of ways. Sometimes could is the past of can. But could is not only used in this way. We also use could to talk about possible actions now or in the future (especially to make a suggestion) A : What shall we do this evening? B : We could go to the cinema. It's a nice day. We could go for a walk. When you go to New York nex month, you could stay with Barbara. Can is also p..