Contractions:

normal ------- Ren-Speech ------- Sentence
It was ------- 'Twas ------- 'Twas a leper that didst need a hand.
                or 'Twere ------- 'Twere a stone groove, my good man.
It is ------- 'Tis ------- 'Tis not my sheep, ask the Blue Baron of its parentage.
Even ------- E'en ------- E'en Baron Steele doth bathe once a month.
Over ------- O'er  -------O'er fifty people hath seen the fair last year, and ten more are expected!
Never ------- Ne'er ------- Ne'er wast there a less faithful wife than the lascivious Marina Bundy.

Normal ------- Ren-Speech
Can't ------- Cannot
Won't ------- Will not
You're ------- Thou art
Isn't  ------- Is not
Don't ------- Do not

Specialized contractions:  T'was, T'is, E'en, O'er, Ne'er, T'were
Don't use modem contractions:  can't, don't, etc.

Pronouncing the suffix "ed" provides a great deal of flavor, for example:  Say not I have deserv-ed thy scorn. Twill not do, to say that am banish-ed from thy sight. Well, you get the point.