Yesterday at ten o'clock Dmitry was writing a letter.-
Was Dmitry writing a letter yesterday at ten o`clock?
Dmitry wasn`t writing a letter yesterday at ten o`clock.
Yesterday at eleven o'clock Omar was playing computer games.-
Was Omar playing computer games yesterday at eleven o`clock?
Omar wasn`t playing computer games yesterday at eleven o`clock.
Yesterday at twelve o'clock Dmitry and Omar were having lunch.-
Were Omar and Dmitry havng lunch yesterday at twelve o`clock?
Dmitry and Omar weren`t having lunch yesterday at twelve o`clock.
Yesterday at one o'clock It was raining.-
Was it raining yesterday at one o`clock?
It wasn`t raining yesterday at one o`clock.