我们下午没有课。

We don't have lessons in the afternoon.

我们只有星期天没有课。

We have no classes only on Sunday.

因为是星期六，我们没有课。

It being Saturday, we have no lessons.

请对你们班里的同学宣布明天没有课。

Please announce to your class that there will be no school tomorrow.

今天下午我们没有课，我们游泳去，好吗？

We are free this afternoon. Let's go swimming, shall we?

直到刚才看到通知，我们才知道今天没有课。（注意时态）

Until now We saw the notice that we have no courses today.

明天没有课打算先睡个好觉，然后受邀和几个意大利朋友聚一下，他们都对中国非常感兴趣，或多或少会说几句中文。

Tomorrow I haven't lessons and plan to have a long and good sleep then some of my italian friends who are very interested in the China and its cultural invited me to have a party.