Usernаme
New member
- Joined
- Feb 1, 2016
- Member Type
- Student or Learner
- Native Language
- Byelorussian
- Home Country
- Belarus
- Current Location
- Belarus
Hello! I know it's possible to use "must+have been" for the past. When I want to speak about a certain event in the past but I don't quite remember when exactly it happened, will such sentences be correct:"It must have been in 1960s when this supposition was proved by American scientists" or "It must have been in 1880s when the Nine Years War started"?