[Video] Q21: A) no change or b) their or c) they're or d) its

Explanation for Question 21 From the Writing Section on the 2021 May Sat (International)

Hey guys. So question 21 is going to be dealing with, 2 like, how do we use a question mark at the end of a sentence? 3 And we're gonna only be using a question mark, if a sentence sentences directly 4 asking us something. So the question says, 5 how are you? The sentence says, 6 how are you? We had a question mark, but if it says, 7 I, uh, want to know how you are, 8 we just use, um, 9 a period because this sentence, isn't a question it's saying, 10 I want to know this. Um, 11 so the sentence isn't asking us anything, 12 it's simply stating a fact, even if that fact might be that I'm asking 13 question. So this says that I HDF was a major breakthrough in astronomy, 14 illuminating the early history of the universe and helping astronomers construct a more complex 15 picture of how do galaxies evolve over time. 16 So, you know, instantly is that this is not a question and not if 17 this simply say, if this sentence simply said, how do galaxies evolve then? 18 Sure. 19 Um, we could put a, we could put a question mark, 20 but it's not saying that it's saying all this other stuff, 21 so we can get rid of D and we can get rid of a, 22 um, because those have a question, 23 mark, and this is not a question, it's a sentence or just like a 24 regular like statement. Um, 25 so now when you see, do, should we say, how do galaxies evolve over 26 time or how galaxies fall over time? 27 Now adding the do is simply unnecessary. 28 We don't just say, how do galaxies have over time? 29 Becaus...