[Video] Q37: No change or cause uneven heat flow and limit or cause uneven heat flow and limits or has caused uneven heat flow and has limited

Explanation for Question 37 From the Writing Section on the Official Sat Practice Test 8

So question 37 is a subject verb agreement question. 2 And we know this because when we look at our answer choices, 3 it uses the same verb, just in different tenses, 4 in different forms. Now, 5 if we look closely at 37, it says that subtle variations in density that 6 both causes an even heat flow and limits the size of droplets. 7 And so here we have the singular version of the verb. 8 We have causes and limits. And the reason I put that there is because 9 the density is singular, right? But that's actually a distraction because we can 10 ask ourselves what is causing the uneven heat flow and what is limiting the 11 size of the droplets. And it's not the density. 12 It's the subtle variations. The reason that we know it's not the density is 13 because this phrase in density. 14 So what we call a prepositional phrase, it describes the variations. 15 So the variations or the subject in density describes what type of variations 16 we have. So it's not actually the density that's causing the changes. 17 It's the subtle variations and variations is plural. 18 So we want the plural version of the verb, which would be cause and 19 limit. So a must be wrong. 20 C must also be wrong because it only has one plural version limits is 21 still singular and D is wrong for a different reason. 22 Right? If we look earlier in the sentence, 23 we can see that we're talking in the present tense. 24 It says this defamation results and results is in the present tense. 25 So we want to stick with the present tense throughout the sentence. 26 Now, B is not in the present tense. B is passed or D is 27 past. So that leaves us with B as our correct answer.