To create parallel structure in the sentence, which phrase would best replace the words "when plays are tragic"?
plays that are funny are more popular than when plays are tragic.
tragedy in plays
plays being tragic
plays that are tragic
in tragic plays

The answer to your question would be that to create a parallel structure in the sentence, the phrase that would replace the words "when the plays are tragic" best is the following one: Plays that are tragic.

Parallel structure, also known as parallelism, is the repetition of a grammatical construction within in a sentence. In this case, the construction repetead is the whole NP (the noun head and its modifiers: plays that are funny and plays that are tragic)

i would say that these are the two thesis statements best for a literary analysis essay on recurring themes in shakespeare's romeo and juliet:

1.  in romeo and juliet, shakespeare demonstrates that love comes in a variety of forms, be it romantic, familial, or between friends.

2.  shakespeare explores the struggle for identity through the character of juliet in his play romeo and juliet.

the other theses aren't reoccurring in this play. 

explanation:

go

explanation:

because it can't be a slow, i would say possibly whoa, but there's nothing too surprising about orange juice, and because it tastes awesome it's a go drink, not food.