Future in the Past
Like Simple Future, Future in the Past has two different forms in English: “would” and “was going to.” Although the two forms can sometimes be used interchangeably, they often express two different meanings.
USE 1 Future in Past
Future in the Past is used to express the idea that in the past you thought something would happen in the future. It does not matter if you are correct or not. Future in the Past follows the same basic rules as the Simple Future. “Would” is used to volunteer or promise, and “was going to” is used to plan. Moreover, both forms can be used to make predictions about the future.
REMEMBER No Future in Time Clauses
Like all future forms, Future in the Past cannot be used in clauses beginning with time expressions such as: when, while, before, after, by the time, as soon as, if, unless, etc. Instead of using Future in the Past, you must use Simple Past.
ACTIVE / PASSIVE