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Now let's have a closer look at what is considered "available grammar literature". For example, an English coursebook "Language Leader", Intermediate Level. The book itself is not bad, even quite good, but its grammar components, as always, are not worth much.

The second chapter has an exercise in which you are supposed to choose between Present Perfect and Past Simple. One of the tasks reads as follows:

I have known/knew him for last 10 years.

This is the brightest evidence of pulpness, because:

A) the correct option, which is Present Perfect Continuous, is not included.
B) of two included options the book considers correct the wrong one (Present Perfect).

The fact that "to know" is considered by some a "stative" verb, does not mean anything for a sound mind (4500 instances of stative verbs in continuous tenses in COHA, if you forgot). If you are still not ready to use the proper Present Perfect Continuous here, give me the reasons why you go for Present Perfect in this sentence. My students said "OK, if we HAVE to choose between those two stupid options, it should be Past Simple, because it's Past Simple, that doesn't tell the aspects, and may be either". So, what are your reasons?

And before you start throwing heavy stuff at me, go google those two options. The phrases "I knew him for many years" and "I have known him for many years" produce virtually equal number of results.
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Comments  (Page 3) 
rinoceronteWhen you have five zeros in your hits, you can't just ignore it.
Exactly -particulary when they are all about why you should not use been knowing.
AnonymousExactly -particulary when they are all about why you should not use been knowing.
So, why shouldn't we use it?
Site Hint: Check out our list of pronunciation videos.
AnonymousOr maybe you do?
Why?
rinoceronteSo, why shouldn't we use it?
Why not google it and read the thousands of posts.
AnonymousWhy not google it and read the thousands of posts.
No, I want to hear from you, why we shouldn't use "been knowing". By us I mean myself and Sherwood Anderson. Formulate the reasons, please.
Students: We have free audio pronunciation exercises.
rinoceronteNo, I want to hear from you, why we shouldn't use "been knowing". By us I mean myself and Sherwood Anderson. Formulate the reasons, please.
How strange that you would want to hear from me, an annonymous German studant rather than from one of the many grammar experts available in the world.

My teacher says that if I follow your advice I would sound uneducated to any native speaker.
AnonymousHow strange that you would want to hear from me, an annonymous German studant rather than from one of the many grammar experts available in the world. My teacher says that if I follow your advice I would sound uneducated to any native speaker.
How am I supposed to know that you are a German student, since you are anonymous? And why did you lie that you taught?

Whom would you consider a grammar expert? What are your criteria?
rinoceronteAnd why did you lie that you taught?
I did not lie. I have never said that I teach. You must be confusing me with someone of the same name.
rinoceronteWhom would you consider a grammar expert? What are your criteria?
As I am a mere student I rely on my teacher to recommend experts for me. I am confident that writers for prestigious establishments such as Princeton, Cambridge and Oxford universities are to be trusted. Their criteria, I expect, would be people well regarded and qualified in their field.
Students: Are you brave enough to let our tutors analyse your pronunciation?
AnonymousI did not lie. I have never said that I teach. You must be confusing me with someone of the same name.
It's cool to talk to anonyms. How many of you are there out there?
AnonymousI am confident that writers for prestigious establishments such as Princeton, Cambridge and Oxford universities are to be trusted. Their criteria, I expect, would be people well regarded and qualified in their field.
Except for one thing: Princeton, Cambridge and Oxford people are mere native speakers, which is a reason for them not to have a clue of what the difference between simple tenses and non-simple tenses, or between indefinite tenses and definite tenses is.
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