Объясните мне в языке время past perfect continuous! заранее !

Время Past Perfect Continuous указывает на действие, которое началось в продолжалось в течение некоторого времени и либо закончилось непосредственно перед неким моментом в или все еще не закончилось к некоему моменту в

I had been typing this text for 2 hours and then found it on the Internet.
Я набирал этот текст два часа, а потом нашел его в Интернете.

I had been waiting for his airplane for 2 hours when it was announced about delay.
Я ждал его самолет уже два часа, когда объявили об его задержке.
Образование Past Perfect Continuous

Утвердительные предложения:

I had been playing We had been playing
You had been playing You had been playing
He / she / it had been playing They had been playing
Вопросительные предложения:

Had I been playing? Had we been playing?
Had you been playing? Had you been playing?
Had he / she / been playing? Had they been playing?
Отрицательные предложения:

I had not been playing We had not been playing
You had not been playing You had not been playing
He / she / it had not been playing They had not been playing
Для того, чтобы поставить глагол в форму времени Past Perfect Continuous, требуется вс глагол to be во времени Past Perfect и причастие настоящего времени (форма V-ing) смыслового глагола.

1. I asked Nick where he was going. 2. I asked him how long he was going to  stay there. 3. I asked him how long it would take you to get there. 4. Pete asked his friends when they were leaving St. Petesburg. 5. He asked them who they would see before they left there. 6. They asked him what time the train started. 7. Ann asked Mike when he had left London. 8. She asked Boris when he would be back home. 9. Boris asked them how he could get to the railway station. 10. Mary asked Tom what time he would come there the next day. 11. She asked me why I hadn't come there the day before. 12. She asked me what I would do the next day if I wasn't busy at my office. 13. I asked Mike what he would do after dinner. 14. I asked my uncle how long she had stayed in the Crimea. 15. Add asked me where I had seen such trees. 16. I asked Becky what kind of book her friend had brought her. 17. Mother asked me who had brought that parcel. 18. He asked her where she usually spent her summer holidays.

Hi friend,My name is Dasha.Im YOUR (ошибка) new penfriend. I am from Russia. I (БЕЗ AM -ошибка) live in Voronezh. I’m 25. I’m A (ошибка) web designer. I work for a popular newspaper. It’s called Voronezh Times.My family IS (ошибка) not very big: father, mother, my sister and me. My father is an engineer and my Mum IS (ошибка) a librarian. My sister is fifteen. HER (ошибка) name is Ann. She is at school. We have two pets. I HAVE (ошибка) a dog and my sister has a hamster. I prefer dogs. They are nice.I like reading. My favorite writer is Den Brown. My favorite book IS (ошибка) Da Vinci’s Code. My favorite sport is tennis. My favorite sports star IS (ошибка) Sharapova. She is a good athlete and she is so beautiful! She is like a model!When I AM (ошибка) free, I like singing and dancing. My favorite music is rap and R&B. My favorite pop star is Britney Spears. She is great! At the weekend I like going to cinema with my friends. My favorite film is Pirates of the Caribbean. My favorite film star is Johnny Depp. HE IS (ошибка) great!What music do you like? WHO (ошибка) is your favorite star? Write soon,Dasha

ошибки исправлены и в скобках написано (ОШИБКА). хотя и слово favorite я бы исправила на  favoUrite, но возможен и такой вариант.