Here’s a breakdown of the passage you provided:
### Grammatical Corrections:
1. **Sentence Fragment**: "We bought poly bags and We were grouped in 9s..." (the 'W' in "We" should be lowercase)
2. **Comma Usage**: "...each group had about 100 poly bags and we perforated them." (a comma before "and" for better clarity)
3. **Phrasing**: "the essence is to reduce the quantity of topsoil will take." should be "the essence is to reduce the quantity