will/shall

It will be my brother's birthday after yours.


Who told you that?

Ok. First, I would like to thank you for your reply anyway. Thanks.

Shall/will is not used for the actions which reapeats continually . For example.

It is Friday tomorrow. It is my birthday next week. As we can see from these example sentences no shall/will is used .

So, I posted the question in this forum related to this grammar rule.

I wouldn't use shall/will in that test either.
I mean, "It may be my brother's birthday after yours " would be correct.

Looking forward to your next answer,

It will be my birthday tomorrow; it will be Tuesday tomorrow; it will be Christmas next week. All perfectly normal and correct.

There is more than one way to talk about future events, repeated or not:

We can use the present simple to talk about events in the future which are 'timetabled':

My plane leaves at 6 in the morning.
The shop opens at 9.30.
The sun rises a minute earlier tomorrow.
It is my birthday next Tuesday.
Your birthday is after mine.

However it is also possible to use the auxiliary verb 'will' to make predictions or simple statements of fact about the future.

My plane will leave at 8.30.
The shop will close at 7.00.
The sun will rise at 6.32 tomorrow.
It will be my birthday next Tuesday.
Your birthday will be after mine.

The word "shall" ain't even in the American language no more. Only a limey would ever use the word "shall."

From an American dictionary (Merriam-Webster):

"Usage Discussion of SHALL
From the reams of pronouncements written about the distinction between shall and will —dating back as far as the 17th century— it is clear that the rules laid down have never very accurately reflected actual usage. The nationalistic statements of 18th and 19th century British grammarians, who commonly cited the misuses of the Irish, the Scots, and occasionally the Americans, suggest that the traditional rules may have come closest to the usage of southern England. Some modern commentators believe that English usage is still the closest to the traditionally prescribed norms. Most modern commentators allow that will is more common in nearly all uses. The entries for shall and will in this dictionary show current usage."

I got it. Accept my sincere thanks for your replies! I am grateful to you all.