Shakespeare's sonnets are written in iambic pentameter, whic consists of five "feet" of one unstressed and one stressed syllable (sometimes noted as "x /" ). Every other syllable is stressed starting with the second. It is considered the most standard rhythm in English poetry. As an example, the scansion of the third verse would be as follows.
x / x / x / x / x /
Rough winds do shake the darling buds of May
You cannot put any sort of endmark (period, question mark, or exclamation point) here because it is not a complete sentence. Complete sentences must have a subject and a predicate. You can tell there's not even a verb here, so this is just a fragment, and we would have to use a comma.
a. Very truly yours,
Dude what is this question? how are we supposed to help you?
Going out for lunch talking to others ect
This would be called a farce play, which is "a comedy that aims at entertaining the audience through situations that are highly exaggerated." (by definition)