jutfrank
VIP Member
- Joined
- Mar 5, 2014
- Member Type
- English Teacher
- Native Language
- English
- Home Country
- England
- Current Location
- England
I think the sentence XXX was yesterday sounds strange; it would be better to be something like XXX happened yesterday.
I understand that it sounds strange under analysis, but it's very natural and common to use yesterday like this.
Yesterday was my birthday.
My birthday was yesterday, not today.
Yesterday was not a good day.
Sometimes we treat yesterday as a time within which events happen (in which case it's adverbial) and sometimes we treat it as an event in itself (in which case it's a noun).