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- [Instructor] Images of a newly-discovered species of macaque show the monkeys grooming, eating, and climbing. That seems reasonable, let's look at the other choices, just to make sure that we can rule them out. Images of a newly-discovered species of macaque show the monkeys grooming, eating, and climb. No, that's not gonna be right at all. If you did climb, grooming, we just have to look at the verb form here, so here we have the present participle grooming. Then we have present participle eating, and then we have present participle climbing. We have the same verb form for each of these, grooming, eating, and climbing, and so that feels good. If we instead replace climbing with climb, we have a different form of the verb. If we wanna get technical, we're breaking the parallel structure, that all of a sudden, if this was climb, it's not the same verb form as grooming and eating, so I definitely wanna rule that out, and same thing with having climbed. Show the monkeys grooming, eating, and having climbed? No, it's a different form. Show the monkeys grooming, eating, and climbed? Now once again, different form. No change is feeling good.

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Writing: Parallel structure - Basic example (video) | Khan Academy

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Instructor] Images of a newly-discovered species of macaque show the monkeys grooming, eating, and climbing. That seems reasonable, let's look at the other choices, just to make sure that we can rule them out. Images of a newly-discovered species of macaque show the monkeys grooming, eating, and climb.

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https://magoosh.com/toefl/2016/toefl-parallel-structure/

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Parallel structure (practice) | Khan Academy

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Learn for free about math, art, computer programming, economics, physics, chemistry, biology, medicine, finance, history, and more. Khan Academy is a nonprofit with the mission of providing a free, world-class education for anyone, anywhere.