This English lesson focuses on the present perfect continuous verb tense. This tense describes actions starting in the past and continuing into the present, or actions completed in the past with a present connection. Examples include "I've been teaching for 20 years" and "I've been making YouTube videos for four years." The lesson explains conjugation by combining subject pronouns (I, you, he, she, we, they) with the conjugated verb "to have" (have, has). The instructor uses the example of wearing sunglasses due to bright, snowy conditions to illustrate the tense's usage.