Present Perfect Continuous Tense.
The Present Perfect Continuous Tense denotes that something began in the past or recent past and may be continuing or has continued up to now.
A Few Models.
I have been teaching English on the Web.
He/She has been (have been) learning English on the Web.
We have been creating / building an English website.
When we want to express/stress the period [(of time) (of the action)], we use prepositions “for” and “since” (often) as well as expressions “lately and “recently” (often) with It.
Now then, the same Models become:
I have been teaching English on the Web for years.
I have been teaching English on the Web since 2012.
I have been teaching English on the Web lately.
I have been teaching English on the Web recently.
Lately, he/she has been learning English on the Web.
Recently, he/she has been learning English on the Web.
….
Since 2012, we have been creating an English website.
For years, we have been creating an English website. …
Homework.
Find some more illustrations and make/line/remember the Syntax (as in lessons nos. 76 and 77).