Shall is used with the first person pronouns I and we to show future action.
Shall is used for the following expressions.
Shall is used in in asking questions. It comes before the subject.
Shall is used for all persons for emphasis.
- I’ll phone you this evening.
- I’m afraid I shall not (shan’t) be able to attend the meeting. (Negative)
Shall can be used with second and third person pronouns to give a command or impose a prohibition.
Shall can be used with second and third person pronouns to talk about rules and laws.
Should is used in negative statements with the negative word not, which can be contracted.