present perfect continious vs past simple

[ostap77]

1)" I've been reading this dialog." 2)"Somehow I didn't memorize it."

The first part no doubt. The second one refers to a point in the past.
What if there was a single speaker, but he would say these two in a row?

 

[Leandro-Z]

I can`t understand what you mean. Do you want to know why there is a change in tense? If you asked me, I would rather respect the Perfect Tense than use Past Simple. Anyhow, I believe it is possible, in a colloquial way, to think the first sentence as a point in time and, so, proceed with the use of Past Simple.

I`m not a teacher. Thus, I will take in consideration and than every correction if I am wrong.

Constantly learning...