Modal Verbs – Shall
This modal verb is most commonly used when the speaker is making suggestions in the “I” and “we” form. It is also used when asking for an opinion about something and talking about the future. It’s also used as a very formal command which is not commonly used.
The negative form of “shall” is “shall not“. “Shall not” is also used as a negative command form which can be used with other pronouns other than “I” and “we”.
They shall never be allowed to play outside alone when it’s dark outside, it’s too dangerous for them!