this something very usefull for class of grammar, how is used past perfect continuous.

1. PAST PERFECT CONTINUOUS Perhaps you had been seeing sentences like these classes before.

2. PAST PERFECT CONTINUOUS

3. PAST PERFECT CONTINUOUS We usually use The Past Perfect Continuous to show that a situation continued in the past until another situation in the past. “I’d been doing language works all weekend long so I decided to have a break at Patty’s house.”

4. PAST PERFECT CONTINUOUS now past Past perfect continuous “I’d been doing language works all weekend long” “I decided to have a break at Patty’s house.”

5. PAST PERFECT CONTINUOUS We also use The Past Perfect Continuous in: Reported speech. “Marilyn said she had been waiting for me for three days in the park.” “Diego said he had been drinking milk until get drunk.” “My classmates said they had been saving money for a barbecue this weekend.”

6. PAST PERFECT CONTINUOUS This tense is often used with these words or phrases:

7. PAST PERFECT V/S PAST PERFECT CONTINUOUS