Переробіть речення з Present Perfect на речення Present Simple​

The majority of economists were sure that immigration benefited our country financially.
According to the economists' forecasts, the unemployment rate will  increase after the new economic reform is implemented.
If you want your business to prosper, you should hire an experienced economist.
Our company is currently recruiting PhD economists having computer skills.
The chief economist was fired as he couldn't cope with his work successfully.
The problem of tax benefits was being discussed by the leading economists at the yesterday's conference.
The market conditions had been carefully studied by the economist before he made up a detailed plan for developing their company.