The document discusses imperative sentences and provides examples related to COVID-19. It defines imperative sentences as verbs that give a command or order and typically end with an exclamation point. There are four types of imperative sentences: instruction, invitation, prohibition, and request. Examples are given showing how each type can be used in the context of COVID-19, such as commands to wear a mask, quarantine yourself, or keep your distance. The document concludes by having the reader practice imperative sentences related to preventing the spread of COVID-19.