[Video] Q39: No change or the 14co2 exposure was initiated by the researchers. or the researchers exposed the samples to the 14co2. or it was time for the researchers to expose the samples to the 14co2.

Explanation for Question 39 From the Writing Section on the 2020 October Sat

So question 39 is asking us, how should we state this information? 2 Right? It's all the same information, but the question is, 3 how do we word it? And this is a question of active versus passive 4 voice. And so when we think about something being an active voice, 5 we think about putting the subject, the actual item, 6 that's doing the action before the verb, 7 right? So whatever comes first is actually doing an action. 8 It's jumping, it's moving, it's doing whatever the verb is. 9 If we think about passive voice, we put the subject after 10 the verb, whatever comes first is passive. 11 It's not actually doing any action. It's receiving the 12 action. So what comes first is doing the action. 13 You've written an active voice. And what comes first is receiving the action you've 14 written in passive voice. And the sat always wants you to use active 15 voice. So let's go through these answer choices and practice choosing which one's active, 16 which one's passive. 17 So in a, it says the samples were exposed to CO2 by the researchers 18 here. Who's doing the action. The researchers are exposing the samples. 19 The samples are simply sitting back relaxing. 20 They're not doing anything. They are being exposed. 21 So in this case, an a I go passive and 22 then I say verb, and then I do subject, 23 right? So Hey is actually passive voice. 24 So I'm not going to choose it. Now B says the carbon 14 exposure 25 was initiated by the researchers. My verb is initiated and it's the re...