passive voice
1)The mountains (situate) in the north of the country.
2)The city (found) many years ago.
3)The river (call) Volga.
4)These animals (see) in that area last year.
5)The monument to thos great scientist (build) next year. ​

1)are situated.

2)was founded

3)is called

4)were seen

5)will be built