The future perfect tense talks about an action in the future before
another action in the future. So what it is doing is talking about the
past in the future.
The format is ‘Subject + will have + past participle’
For example:
You can call me at the office tomorrow at 8am. ‘I will have arrived’ at the office by 8.
Even though I am still not at the office I know I will be there at 8am tomorrow, so you can phone me.
The first action is me arriving at the office. The second action is you calling me.
Another example:
‘The flight will have left’ by the time you arrive.
The Garuda flight departs at 10.30am. You will arrive at the airport at 11.15am. When you arrive, the flight will have left.
The first action is the Garuda flight departing. The second action is me arriving at the airport
And another example:
They will be hungry when they arrive, ‘they won’t have’ eaten during the flight.
The flight is long and there is no food served, so when they get off the flight they will be hungry.
The first action is taking the long flight. The second action is being hungry when they get off the plane.
For negative sentences :
The format is ‘Subject + will not have + past participle’
For example:
‘They will not have’ read that book in time.
‘He will not have’ arrived at school by then.
source : KGI
The format is ‘Subject + will have + past participle’
For example:
You can call me at the office tomorrow at 8am. ‘I will have arrived’ at the office by 8.
Even though I am still not at the office I know I will be there at 8am tomorrow, so you can phone me.
The first action is me arriving at the office. The second action is you calling me.
Another example:
‘The flight will have left’ by the time you arrive.
The Garuda flight departs at 10.30am. You will arrive at the airport at 11.15am. When you arrive, the flight will have left.
The first action is the Garuda flight departing. The second action is me arriving at the airport
And another example:
They will be hungry when they arrive, ‘they won’t have’ eaten during the flight.
The flight is long and there is no food served, so when they get off the flight they will be hungry.
The first action is taking the long flight. The second action is being hungry when they get off the plane.
For negative sentences :
The format is ‘Subject + will not have + past participle’
For example:
‘They will not have’ read that book in time.
‘He will not have’ arrived at school by then.
source : KGI
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