Usage of will and shall
In general, use will to talk about the future and shall to make formal obligations, commands, or solemn promises. For simple future statements, use "I/we will" or "he/she/it/you/they will," as "shall" with these subjects is very formal or outdated. In questions, use "Shall we...?" for suggestions or offers. In American English, "will" is used for all subjects to express the future, while "shall" is rare.
Modern usage (especially American English)
Will: is used for most future actions, predictions, and intentions.Example:
"We will go to the park tomorrow".Example:
"It will be sunny next week". Shall: is largely avoided in modern, informal English.Traditional and formal usage
Simple future:
The traditional rule uses "shall" with the first person ("I," "we") and "will" with the second and third person ("you," "he," "she," "it," "they").Example:
"I shall begin my work now".Example:
"He will start the project".Determination, command, or promise:
This rule is reversed, with "will" for the first person and "shall" for the second and third.