I. use the correct tense-forms of the verbs in brackets. 1. it (be) a cold winter night. it (snow) hard and i (want) to get back home quickly. 2. i never (work) so hard in my life as now when i (write) my diploma-paper. 3. i (learn) riding a bike when i (be) five years old. i (ride) for 20 years already. 4. where he (go) when you (meet) him in the morning? -to the library. 5. i never (wear) a tie to work and i (refuse) to start now. 6. no sooner i (reach) the door than i (realize) it (lock). 7. as i (cross) the road i (see) alice coming out of the bookshop. she (say) she (buy) some english books in the original.

Вот правильные формы глаголов для каждого предложения:

1. It was a cold winter night. It was snowing hard and I wanted to get back home quickly.
2. I have never worked so hard in my life as now when I am writing my diploma-paper.
3. I learned (или learnt) riding a bike when I was five years old. I have been riding for 20 years already.
4. Where was he going when you met him in the morning? — To the library.
5. I never wear a tie to work and I refuse to start now.
6. No sooner had I reached the door than I realized it was locked.
7. As I was crossing the road I saw Alice coming out of the bookshop. She said she had bought some English books in the original.

Вы можете проверить правила использования времён в Grammar Handbook на British Council или воспользоваться Cambridge Dictionary Grammar для уточнения нюансов употребления Past Perfect и Present Perfect Continuous. Дайте знать, если вам нужен разбор правил для конкретного предложения из этого списка.