‘Shall’ is not very frequently used in modern English; However, you still see people using ‘Shall’ here and there.
In modern English, it is used to make an offer, to make sure something must definitely happen, or to ask for advice.
In older grammar, the correct way to use ‘shall’ was with first person pronouns (I and We), whereas ‘will’ was used with second and third person pronouns (you; he, she, it, they)
📘Shall comes first in the verb phrase (after the subject and before another verb).
We use it mostly with I and we:
I shall post it to you tomorrow.
Shall cannot be used with another modal verb:
I shall have to be at the airport by 5 pm.
Shall can be followed by have to, need to and be able to:
We shall have to tell him what happened.
The good news is I shall be able to join you at your meeting next week.
The negative form of shall is shan’t.
We don’t use don’t, doesn’t, didn’t with shall:
I shan’t be home tomorrow night.
We shan’t know the result of the tests till Tuesday.
We can use the full form shall not in formal contexts or when we want to emphasis something:
The management shall not be responsible for damage to personal property.
We don’t often use the negative