The simple future tense indicates that the action is in the future relative to the speaker. Verbs in the future tense are not changed (or inflected), instead, helping verbs such as will and shall are added before the base form of the verb.
I will buy a computer tomorrow.
I shall return.
Shall we dance?
Will you help me?
In the first example, the helping verb will is added before buy which is a verb in base form. In the second sentence, the helping verb shall is added before the verb return. The future tenses in question are also shown above.