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Yesterday at ten o'clock Dmitry was writing a letter.
Yesterday at eleven o'clock Omar was playing computer games.
Yesterday at twelve o'clock Dmitry and Omar were having lunch.
Yesterday at one o'clock It was raining.

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.