你最喜欢的日子是星期几？

What day is your favourite day?

明天是星期几？

What day is it tomorrow?

我忘了今天是星期几。

I forgot what day is today.

他问我今天是星期几。

He asked me what day is today.

我忘了昨天是星期几。

I forgot what day it was yesterday.

你知道今天是星期几吗？

Do you know what day it is today?

你知道会议是星期几吗？

Do you know what day the meeting is?

我们可以查一下今天是星期几吗？

Can we check what day is today?

你记得我们约会是星期几吗？

Do you remember what day our date is?

你能告诉我明天是星期几吗？

Can you tell me what day it is tomorrow?