The astronauts, sarah and thomas, are seated upstage in a simulation room looking forward at a large screen. sarah is to the left of thomas. the man who controls the machine, drew, looks on from their left and then moves upstage to start the machine.

thomas: well, it looks like it’s about to begin.

sarah (away from thomas to look at drew): yes, here we go!

heres a screenshot directly from the question

- "a nonrestrictive clause functions as a modifier to a noun (that is an object, person or concept). these clauses can be described by the following three options: it is set off by comas, it contains a subject and a verbs and it adds nonessential information to the sentence.

for example, in "here is bill gates, who confounded microsoft software company" we can identify "who confounded microsoft software company" as a nonrestrictive clause modifying the noun bill gates. this clause can be describes as a nonrestrictive clause because it is separated by a comma, it adds nonessential information to identify who bill gates is and it must contain both a subject (who) and a verb (confounded)."