Future tense is a verb form which is marked by time (tense).
The future tense is used for actions in a time which has not yet happened. In order to explain and understand future tense, it is useful to imagine time as a line on which the past tense, the present tense and the future are positioned.
- Sangmeister, Lisa. (2009). Past Tense in English: From OE to PDE, p. 11.