The Future Tense of English
The future tense simply indicates an action that will happen in the future. Of course, unlike the tenses of the present and past, there is no way of knowing whether the action will actually take place. In both Latin and English, the future tense is used just like the other tenses; they state the future action as if it will definitely take place. Theoretical or idealistic actions are expressed with the subjunctive mood. There is no future subjunctive mood because something can not be grammatically theoretical or ideal and at the same time be expected to happen in the future. One or the other must be chosen.
The words “will" and “shall" are the auxiliary words used to indicate the future tense. Some scholars believe that “shall" is reserved only for first person verbs and “will" is to be used with the second and third person, as in:
I/We shall go to the field.
You (singular and plural) will go to the field
He/She/It/They will go to the field
However, “shall" is falling into disuse. Often, both “will" and “shall" are shortened to “’ll", as in:
I’ll go to the field
You’ll go to the field
He’ll go to the field
Since “’ll" can be used in place of both “will" and “shall", a writer or speaker can avoid choosing.