Ответ:

  1. In summer we lay in the sun and swim in the river. Now we don\’t do it. — In summer we used to lay in the sun and swim in the river.
  2. When I was seven, I went to the toy shop and looked at the toys there. I don\’t do it now. — When I was seven, I used to go to the toy shop and looked at the toys there.
  3. My father played the piano when he was younger. He doesn\’t do it any longer: he has no time. — My father used to play the piano when he was younger.
  4. When the Smiths came to Moscow, they always stayed with us. Now they stay at the hotel. — When the Smiths came to Moscow, they used to stay with us, but now they stay at the hotel. 5. In order times people often wrote letters to each other. Not many people do it now. — In order times people used to write letters to each other.
  5. When my granny was young, she and her friends danced a lot. But now she says she is too old for dancing. — When my granny was young, she and her friends used to dance a lot.