You won't believe what (happened )to me last saturday. i (was walking )along the beach with my dog, sam, when he (spotted )something in the sand. he (started )digging it up and waving his tail happily. it (turned )out to be a wooden box with coins in it. i quickly (grabbed )in from sam who (was trying )to chew it and took it straight to my history teacher, mr brown. as soon as i (saw )the look in his eyes, i knew we (had found )something special. together, (went )to the local museum. they (had examined )the coins and they announced that they were 250 years old. can you believe it a box full of valuable coins (had been waiting )for someone to find to for so many years the people at the museum (came )to investigate. they (had dug )all around the area, but they (did not find )anything else. it's still a bit of a mystery how the box (had come) to be there.
напишите почему нужно поставить то, что в скобочках. в каждом случае
2) past continuous , present simple
3, 4) past simple
5)past simple , past continuous
6,7)past simle
8, 9 не знаю
10 ) past simple
11) past simple