Grammar 101

Robertson / Pocket Grammar / 185
Verb to Be future tense
The verb to be is different to other tenses because it does not have: Subject + verb + object
The verb to be has a compliment. Subject + verb + compliment There is no action just be. A
compliment adds information about the state or function of the subject:
Future perfect be refers to a state or condition that will continue until another point in the future.
Condition/state
Future time
Past Present Future
By this time next year, I will have been a doctor for ten years
The verb to be in the future takes 2 forms will have been or going to have been.
Structure
Subject + will + have + been + Complement
I will have been a doctor
Structure
Subject + am/is/are + going to + have + been + Complement
I am going to have been a doctor
Unlike Simple Future forms, Future Perfect ‘be’ forms are similar and usually interchangeable.
Since to two forms are generally used to express the same meaning and context we tend to use
the will form as it is shorter and simpler.