Present perfect simple and continuous

e.g. I have known him since 1990

           ongoing states/actions

           live-study-work

Focuses on the result

e.g. I have done my homework. (result: Now I can go out)

focuses on “how many/much” 

e.g. I have drunk 3 coffees

Action which is finished

e.g. I have written some emails

Yet/Already

e.g. Haven´t you finished yet?

Used with “for/since”

e.g. I have been living since 1990

                       ongoing   actions

                     live-study and work

Focuses on the activity

e.g. I have been doing my homework

focuses on  “how long”

e.g. How long have you been learning English?

Action which may continue

e.g. I have been writing some emails

Temporary situations

e.g. She’s been running a lot recently. (She doesn’t usually do this).

Shows evidence of recent activity

e.g.  I know, I’m really red. I’ve been running!