Shall, Will. The future tense requires shall for the first person, will for the second and third. The formula to express the speaker's belief regarding his future action or state is I shall; I will expresses his determination or his consent. Should. See under Would. So. Avoid, in writing, the use of so as an intensifier: “so good;” “so warm;” “so delightful.” On the use of so to introduce clauses, see Rule 4. Sort of. See under Kind of.