In English, we make negative sentences or commands by using many forms of ‘no’. Either in the form of ‘doesn’t’ ‘didn’t’, ‘not’…etc. The same can be said for Italian except for little changes.
Negative commands in Italian can be explained by using the ‘non’ before infinitive form of the verb.
For example:
1. Don't eat in the corridors! = Non mangiare nei corridoi!
2. No smoking! = Non fumare!
3. Don't throw things out of the window = Non gettare oggetti dalla finestra.
However, if you want to direct a negative commands to more than one person, use the normal imperative preceded by non.
e.g.:
1. Don't run, boys! = Non correte, ragazzi!
2. Don't eat too much, gentelmen! = Non mangiate troppo, signori!
If we would want the negative commands using formal imperative, just put non before it.
e.g.:
1. Don't drink it! = Non lo beva!
2. Don't give it to him! = Non glielo dia!