If it's ending punctuation, as in a question mark, exclamation point, semi-colon, dash, or period, stop and breath. When two characters share a ten syllable line, it represents the kind of affinity you experience with a close friend or loved one who can finish your sentences. There's no doubt that the lovers are meant for each other. I were thy bird. Shakespeare wrote scripts, not books.
Countless choices make each production unique.
Read a scene, then watch and listen to the same scene in two or more versions. This offers an incredibly rich opportunity for discussion. Your public library may have a good collection. It's smart and eminently readable. And while your old friends the Cliff Notes are still available, Barron's Book Notes are far better.