Using the Spanish perfect future to talk about completed actions in the future with reference to another future action (El Futuro Perfecto)

El Futuro Perfecto in Spanish for assumptions

We use El Futuro Perfecto to make an assumption about an action that will have finished in relation to another future action. We need to include a future time phrase so that this is evident.

Have a look at this example:

We can see a future reference (by 4) and then a completed action that will have happened before/by that timeframe. That completed action is expressed with El Futuro Perfecto.

Sometimes the future reference is expressed in an earlier sentence about an action that occurs before the action expressed with El Futuro Perfecto, for example:

Here are other examples:

It is very common to find time phrases of this type when using El Futuro Perfecto:

See also:

Conjugate regular verbs in the perfect future in Spanish (El Futuro Perfecto)

Conjugate Spanish irregular verbs in the perfect future in Spanish (El Futuro Perfecto) 

Using the Spanish future perfect to talk about the past (El Futuro Perfecto)