今天是不是星期一? how can we answer, comment repondre 汉语/漢語/中文

Bonjour, j'ai un petit soucis avec l'emploi de 是。
Hi, I have a problem with 是

Pour répondre de manière négative à cette question:
To answer with a negation:

今天是不是星期一?

Faut-il mettre 是 ou non?
Do I must use 是 or not ?

不是,今天星期四。

不是,今天是星期四。

谢谢 à ceux qui accepteront de me répondre:)
谢谢 to all people who will accept to anwer me :)

Yes you've got the right answer!

Is it this ? : 不是,今天是星期四。

Or

不是,今天星期四。

谢谢 WRLi ^^

Both are right. If you just leave out the “是” in the middle, it'll be less formal ;)

谢谢你 I am really happy :)

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