20180101

Present Future Perfect Continuous Tense


WILL + HAVE + BEEN + Ving

Present Future Perfect Continuous emphasizes on duration/how long a process of an activity that will happen before another activity or another time in the future:
I will study at 7 pm. Kevin will get home at 8 pm. At 8 pm I will be studying. By the time Kevin gets home, I will have been studying for one hour.
I will have been studying for one hour :  giving information that emphasizes on the duration of my activity that will have been done by the time Kevin gets home at 8.00 tonight.

Other Examples:
The film will have been playing for 15 minutes by the time my parents come tonight.
If you come to my house at 8 o’clock tonight, I will have been working on my paper for 30 minutes.
I am still at work now. Usually my son goes to bed at 9 pm. So by the time I get home, my son will have been sleeping for 1 hour.

Present Future Perfect Continuous and Present FuturePerfect can also be used for an activity that started in the past:
When I graduate next month, I will have studied in Cambridge University for 6 years.
When I graduate next month, I will have been studying in Cambridge University for 6 years.

For situations like the examples above we can use either Present Future Perfect or Present Future Perfect Continuous. Both tenses are correct



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