Future tense is used to talk about future actions.
Affirmative sentence
SUBJECT+ WILL/ SHALL + V1+ OBJECT
I shall leave for Delhi tomorrow.

Negative sentence
SUBJECT+ WILL / SHALL+ NOT + V1 + OBJECT
I shall not buy a new dress for the party.

INTERROGATIVE SENTENCE
WILL/ SHALL+ SUBJECT+ V1+ OBJECT?
Will they come for dinner tonight?