Guess the sign
Go straight!
What's the matter? - I'm sad. - ... - OK.
Cheer up!
Guess the sign
Don't turn right!
Guess the sign!
Don't smoke here!
Guess the sign
Don't run!
Use imperatives.
Walk the dog, please.
What's the matter? - I'm cold. - ... - Thank you!
Drink some hot tea.