Sentence examples for some of it from inspiring English sources

"some of it" is grammatically correct and commonly used in written English.
It is typically used to refer to a part or portion of something. For example: - "I only ate some of the pizza, but I left the rest for later." - "She couldn't finish all of her homework, but she completed some of it." - "They visited several countries on their trip, but they only saw some of it."