The progressive form is rarely used. It is

I shall have been writingWe shall have been writing
You will have been writing You will have been writing
He will have been writingThey will have been writing

Giving all forms singular and plural, first, second, and third persons of each tense constitutes the conjugation of a verb. Giving one person in each tense constitutes the synopsis of the conjugation.

The following is a synopsis of all the tenses of the active voice in the first person singular number of the verb write:

Active Voice

TensePrimaryPresentI write (simple form)
I am writing (progressive form)
I do write (emphatic form)
PastI wrote (simple)
I was writing (progressive)
I did write (emphatic)
FutureI shall write (simple)
I shall be writing (progressive)
Perfect
or
Secondary
Present PerfectI have written (simple)
I have been writing (progressive)
Past PerfectI had written (simple)
I had been writing (progressive)
Future PerfectI shall have written (simple)
I shall have been writing (progressive)

Exercise 103

Conjugate the following in the active voice:

1. Simple past tense of walk.

2. Present progressive tense of walk.