Present Perf. Simple vs Present Perf. Cont.

Hi, Guys!!!, 

Do you remember the difference between Pres. Perf. Simple and Pres. Perf. Continuous?

Firstly, you should look at your notes, then pay attention to this picture and after that, click on these links to check your knowledge.

perfect-english-grammar (PRES.PERF.S. vs. PRES.PERF.CONT.)

perfect-english-grammar (2)

autoenglish.org