Learning language for real life

Weekdays 星期
Today is Sunday.
今天是星期天

Today is Monday.
今天是星期一

Today is Tuesday.
今天是星期二

Today is Wednesday.
今天是星期三

Today is Thursday.
今天是星期四

Today is Friday.
今天是星期五

Today is Saturday.
今天是星期六

我們也可以把Today is改成Yesterday was或是Tomorrow will be

例如:
Yesterday was Saturday.
昨天是星期六

Tomorrow will be Saturday.
明天是星期六

請考考自己
如果今天是星期一，那昨天應該怎麼說? 明天又該怎麼說呢?