1 -Nobody has used this room for years

-People haven't used this room for years

2.  Someone steals things from supermarkets every day

3. No one introduced to any of the guests at the party last night

4. They are going to increase our salary

5. People believed the earth is flat for a long time

1. This room has not been used for years.

-> Nobody has used this room for years

->People haven't used this room for years

2. Things are stolen from supermarkets every day

->Someone steals things from supermarkets every day

3. I wasn't introduced to any of the guests at the party last night

->No one introduced to any of the guests at the party last night

4. Our salary is going to be increased

->They are going to increase our salary

5. For a long time, the Earth was believed to be flat.

->People believed the earth is flat for a long time