Respective, respectively. These words may usually be omitted with advantage.

Works of fiction are listed under the names of their respective authors.Works of fiction are listed under the names of their authors.
The one mile and two mile runs were won by Jones and Cummings respectively.The one mile and two mile runs were won by Jones and by Cummings.

In some kinds of formal writing, as geometrical proofs, it may be necessary to use respectively, but it should not appear in writing on ordinary subjects.

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].

Split Infinitive. There is precedent from the fourteenth century downward for interposing an adverb between to and the infinitive which it governs, but the construction is in disfavor and is avoided by nearly all careful writers.

To diligently inquireTo inquire diligently