在五月的第二个星期天。

It's on the second Sunday in May.

母亲节是在五月的第二个星期天。

Mother's Day is on the second Sunday in May.

一个是五月的第二个星期天的母亲节。

One is Mother's Day on the second Sunday of May.

我们在第二个星期天去公园。

We went to the park on the second Sunday.

第二个星期天，我和常彦去了教会。

The next Sunday, Chang Yan and I went along to church.

第二个星期天的早上，男孩来到老房子，跟老人聊天。

The next Sunday morning, the boy visited the old house, and he talked to the old man.