Yes — the sentence Goose feathers are used to fill blankets and pillows. is grammatically correct.
Here is why, in simple steps:
- Subject and verb match: "Goose feathers" is plural, and the verb "are" is the correct plural form. That means they agree.
- Good word order: The sentence says what happens: the feathers (subject) are used (verb) to fill (purpose) blankets and pillows (objects).
- Passive voice: This sentence is in the passive voice, which means it tells what is done (feathers are used) but not who does it. That is okay here.
- Punctuation and capitalization: The period at the end is correct. If the sentence is in the middle of a sentence, write "goose" in lowercase; at the start it is capitalized.
If you want to say it a different way, here are two simple alternatives:
- Active voice (tells who does it): People use goose feathers to fill blankets and pillows.
- Another passive way: Blankets and pillows are filled with goose feathers.
All three sentences mean the same thing and are correct. Great job!