Future Perfect and Future Perfect Continuous Tenses
Future Perfect &
Future Perfect Continuous
Tenses
1. Future Perfect tense
actions which will be completed by a definite time in the future.
Examples:
The mechanic will have serviced my car by Wednesday.
2. We use the words already and just with the Future Perfect Tense to refer to actions or situations which will be finished by an approximate time in the future.
Examples:
By next week, Mr. Lim will have already negotiated the price of the house with the real estate agent.
I will have just entered the university next April when my sister graduates.
Remember!
The Future Perfect Tense is formed in this way:
will have + past participle of the verb
Examples: will have gone
will have calculated
3. We use the Future Perfect Continuous tense
when we want to refer to the duration of an action or an event at a definite time in the future.
We usually use adverbs of duration and time to state how long the action will last and when it will take place.
Examples:
She will have been studying in Glasgow for three years by next September.
for – Adverb of duration
by – Adverb of time
Remember!
The Future Perfect Continuous tense is formed in this way:
will have + been + past participle of verb + ‘ing’
Examples: will have been raining
will have been driving
Pages 55 to 57
Learning English by Uncle Teng 
SOUN RITHY said
Thanks for explaining of tenses.