In this TESL training video the teaching idea for the past perfect continuous tense involves giving the students a prompt and asking them to finish it with a sensible answer in the past perfect continuous tense. For example:
I didn't have dinner last night... because I had been snacking all day.
She passed the test... because she had been studying hard.
The past perfect continuous is a rarely used tense and is often quit confusing for learners of English as well as new English teachers. Taking a 120-hour online teaching course with ITTT will give the knowledge needed to make sure you know how to explain such tenses to students the moment you step into your first TESL classroom.