birgit33
Member
- Joined
- Feb 27, 2011
- Member Type
- Student or Learner
- Native Language
- Swedish
- Home Country
- Sweden
- Current Location
- Thailand
"Scientists have proof/proven that photovoltaic cells convert sunlight into energy."
"Scientists have proof/proven that photovoltaic cells convert sunlight into energy."
Are both proof and proven correct in this sentence ?
"Scientists have proof/proven that photovoltaic cells convert sunlight into energy."
Are both proof and proven correct in this sentence ?