Used in the subscriptions of letters, as your (affectionate, very,etc.) friend.

Used in the subscription of letters: pleasure, happiness.

Yours ever: used formulaically at the end of a letter (cf. yours, pron. 4).

yours faithfully: a (usually formal) subscription to a letter, esp. (in later use) one where the recipient is addressed as Dear Sir or Madam…

I (†will) remain: used in formulas for closing a letter.

For the public good, now usually with the implication of no financial recompense. Also occasionally attributive or as adj. Cf. pro bono, adv. adj.

Used in the subscription of letters. Frequently in yours sincerely.

In plural. Used as a formula requesting that the person addressed (in speech or writing) convey the expression of the speaker's or writer's…

Used formulaically in the subscription of a formal letter, esp. as yours respectfully.

Used formulaically to end a (now usually formal) letter; also truly yours and variants.