Hi! Let's make your sentence clearer.
Original: A combine harvester picks these grains to make popcorn.
Better ways to say it:
- A combine harvester harvests the corn used to make popcorn.
- A combine harvester collects the corn that becomes popcorn.
- A machine called a combine harvester gathers corn for popcorn.
Why?
- "Picks" is okay, but we usually say machines "harvest" or "collect."
- "These grains" is unclear for someone reading the sentence alone. Saying "corn" or "corn kernels" is clearer.
- "To make popcorn" is fine, but "used to make popcorn" or "for popcorn" sounds a little more natural.
Great job writing a sentence! Try one of the new versions next time.