昨天是星期天。

Yesterday was Sunday.

《牛津词典》

昨天是星期天，天气非常宜人。

Yesterday was Sunday and it was a nice day.

youdao

昨天是星期天我很忙。

It was Sunday yesterday and I was very busy.

youdao

昨天是星期六，所以今天是星期天。

Yestaday is Saturday, so today is Sunday.

youdao

昨天是星期六，所以今天是星期天。

Yestaday is Saturday, so today is Sunday.

youdao