Which of the following needs a comma? clean up your area when you have finished. finishing includes cleaning up your work area. when you have finished clean up your area. your area should be cleaned after you finish.

The right answer is letter C: When you have finished, clean up your area. This sentence starting with "when"  as a relative pronoun supposes a dependent clause will be separated from an independent one by a comma "clean up your area".

Option A follows a standard structure where the dependent clause follows the independent one; option B shows "cleaning up" as a detail for "finishing" as the subject of the sentence; and option D uses "cleaned" as an adjective after a modal verb "should".

answer: may i see the sentences?

the correct answer is d. in john paston's letter written friday, 14, 1476, he expresses his fear that he may have to go to war.

indeed, although the black death was ravaging europe, the pastons were relatively safe from it due to their social status as they were part of the landed gentry. it is clear that the vast majority of the victims of the pandemic were the poor. the reason why he is weary of having to go to war is because at the particular time england was also devastated by the war of the roses and paston, being a courtesan was inevitably involved.