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1) when do Russian people have a tradition to make pancakes?
2) In what country are there many famous folk heroes?
3) Who were the Russian bogatyri determined to fight with?
4) Who did the guide tell the legend of black ravens?
5) Where did the children spend the day?

1) The pupils have just listened to the scientist
2) My friend has already eaten caviar on his birthday
3) A woman has cooked some traditional dishes for festival
4) Girls and boys have jumped over the bonfire on Ivan Kupala night
5) The child hasn't written the letter to Father Frost yet

"Past Perfect" 
Had you worked? – Ты работал? 
When had you written the letter? – Когда ты написал письмо? 
He had finished his work by five o'clock and went home. 
When they arrived I had finished my work. 
Peter had gone away when they reached the castle. 
" Past Perfect Continuous". 
Had you been working? 
Had she been working? 
I was very tired when I got home. I’d been working hard all day. 
We’d been playing tennis for about half an hour when it started to rain heavily. 
I was disappointed when I had to cancel my holiday. I’d been looking forward to it.