15 shift the sentences from present to past there is a supermarket in our village 20 years ago there isn't a bookshop in our village 20 years ago there are many wooden houses in our village 20 years ago there aren't any plants in our village 20 years ago

1. There was a supermarket in our village 20 years ago.
2. There wasn't a bookshop in our village 20 years ago. 
3. There were many wooden houses in our village 20 years ago. 
4. There weren't any plants in our village 20 years ago.