GMAT Sentence Correction (SC) | Re: Tropical bats play important roles in the rain forest

Hiameyaprabhu ,aiding andpollinating are notverbs ; they areparticiples (specifically present participles).

Not at all. Different parts of the sentencecan be indifferent tenses.

p.s. Our book EducationAisle Sentence Correction Nirvana has a special note on Tenses and Parallelism , along with a simple example. Have attached the corresponding section of the book, for your
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