Negative
1My sister isn’t third-year student at the Mechanical Faculty.
2The students of our country don’t have the best conditions for their study.
3There aren’t very many libraries in our capital.
4 It doesn’t often snow in the British Isles in winter.
Interrogative
1 Is your sister third-year student at the Mechanical Faculty?
2Do the students of our country have the best conditions for their study?
3 Are there very many libraries in our capital?
4 Does it often snow in the British Isles in winter?