"pro": Shall, Will /alongside can, must, may, ought to ..., have to .../
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To keep it simple:
Will Shall
Used to express the future tense Used to express the obligation
I will do we will do I shall do we shall do
you will do you will do you shall do you shall do
he/she/it will do they will do he/she/it shall do they shall do
/one may use shall in 1st person singular and plural as/for Future tense as well/
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John will do.
The Doer is the 1st (Main), the "Environment" is the 2nd(not Main).
/the meaning of the Future as an Intention (Freedom) of the Doer/
John shall do.
The "Environment" is the 1st (Main), the Doer is the 2nd(not Main).
/the meaning of Obligation as the Dependency of the Doer/
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Consciousness and the "Environment" are Complementary.
