she could be with her friends right now laughing at him.句子中could表什么?

问题描述:

she could be with her friends right now laughing at him.句子中could表什么?

我觉得应该是can的过去时 can be是个词组right now现在能用can的过去式?我看着好像不太对 也许是could比can更委婉 十多年没接触英语了 也不太会了