In the Present Continuous tense, the action is on-going/ still going on and hence continuous. The present continuous tense is used to talk about actions that are happening at this curent moment.In the Present Perfect tense, the action is complete or has ended and hence termed Perfect. The exact time when the action happened is not important and hence, it is not mentioned in this tense. In the Present Perfect Continuous tense, the action has been taking place for some time and is still ongoing.The duration for which the action has been going on is usually mentioned in the present perfect continuous tense.

1. I AM EATING breakfast right now. Please do not bother me. = present progressive. 2. I HAVE BEEN EATING breakfast for 10 minutes. (It is now 8:10 a.m. I started at 8:00 a.m. I will probably finish at 8:20 a.m.) = present perfect progressive. 3. Today is Wednesday. I ate breakfast on Sunday, Monday, Tuesday, and today. So I HAVE EATEN breakfast every day this week (from Sunday through Wednesday). Thursday is the future, so I do not know whether I will or will not eat breakfast on the other days of this week. P.S. As you know, "progressive" is used by some people for "continuous."