Present perfect progressive vs. present perfect

Present Perfect Progressive
(a) Rita and John are talking on the phone. They have been talking on the phone for twenty minutes
The Present Perfect Progressive expresses the duration of present activities that are in progress, using action verb as in (a).
Present Perfect
(b) Rita has talked to John on the phone many times (before now)
(c) Incorrect: Rita has been talking to John on the phone many times
(d) Rita has known John for two years
(e) Incorrect: Rita has been knowing John for two years
The present perfect expresses:
1. Repeated activities that occur at unspecified times in the past, as in (b) or
2. The duration of present situation as in (d), using non-action verb
(f) I have been living here for six months or
(g) I have lived here for six months
(h) Al has been wearing glasses since he was ten or Al has worn glasses since he was ten,
(i) I’ve been going to school ever since I was five years old or I’ve gone to school ever since I was five years old.
For some (not at all) verbs, duration can be expressed by either the present perfect or the present perfect progressive. (f) and (g) have essentially the same meaning, and both are correct.
Often either tense can be used with verbs that express the duration of usual or habitual activities/situations (things that happen daily or regularly), e.g., live, work, teach, smoke, wear glasses, play chess, go to school, read the same newspaper every morning etc.

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Using since and for

SINCE
(a) I have been here (since eight o'clock, Since Tuesday, Since May, Since 1999, Since January 3, 2001, Since yesterday, Since last month)
Since is followed by the mention of a specific point in time: an hour, a day, a month, a year etc.
Since expresses the idea that something begab at a specific time in the past and continues to the present.
(b) Correct: I have lived here since May
Correct: I have been here since May
(c) Incorrect: I am living here since May
(d) Incorrect: I live here since May
(e) Incorrect: I lived here since May
Incorrect: I was here since May
The present perfect is used in sentences with since:
In (c): The present progressive is NOT used
In (d): The simple present is NOT used
In (e): The simple past is NOT used
Main clause (present perfect)              Since clause (simple padt)
(f) I have lived here                           since I was a child
(g) Ali has met many people             since he came here
Since may also introduce a time clause (i.e, a subject and verb may follow since)
Notice in the examples: The Preent Perfect is used in the maim clause; the simple past is used in the since-clause
FOR
(h) I have been here (For ten minutes, For two hours, For five dsys, For about three weeks, For almost six months, For many years, For a long time)
For is followed by the mention of a lenght of time: two minutes, three hours, four dsys, five weeks etc.
Note: If the noun ends in -s (hours, days, weeks, etc.), use for in the time expression not since.
(i) I have lived here for two years. I moved here two years ago, and I still live here
(j) I lived in Athens for two years. I don' t live in Athens now.
In (i): The use of the present perfect in a sentence with for+a length of time means that the action began in the past and continues to the present.
In (j): The use of the simple past means that the action began and ended in the past.
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