Definition of shall:

part of speech: verb

An auxiliary and defective verb; one of the two signs employed to express futurity, will being the other; in the first person shall simply foretells or declares; in the second person and third person it promises or expresses determination; interrogatively, shall either asks for permission or for direction; shall, like will, apart from its othersenses, uniformly denotes futurity.

Usage examples:

• I shall hate you if you do. Pauline Lester in "Marjorie Dean High School Freshman".

• We shall have to do something about them. Marie Belloc Lowndes in "Jane Oglander".

• He shall have it all! Ralph Bonehill in "Leo the Circus Boy".

• I shall think the matter over for a day or two. Marie Belloc Lowndes in "Jane Oglander".