We use imperatives to tell someone to do something or to give instructions, commands, warnings, directions, requests, and suggestions.
- Close the door!
- Sit down!
- Run!
Use imperative form + 'and' to say what will happen if the command is followed.
- Go straight, and you will see the station.
- Hurry up, and you will be in time for the movie.
Use imperative form + 'or'/'otherwise' to say what will happen if the command is not followed.
- Study hard, or you won’t pass your next exam.
- Read the question carefully, otherwise you won’t get the right answer.
- Listen carefully, otherwise you won’t understand what I am saying.