Разъяснить использование (указать сигнальные слова) Обычного Прошедшего и Истинного

Разъяснить внедрение (указать сигнальные слова) Простого Прошедшего и Истинного Совершенного времен в последующих предложениях.

1. We had a nice walk two days ago. 2. When did the last readers' conference take place? 3. When my son was in the country last winter he played snowballs almost every day. 4. He used to ski and to skate in winter. 5. He visited his native town in 1990. 6. The man entered the room, sat down at the table, ordered some food and began to read a newspaper. 7. She looked for a job for several months. 8. I found this purse at the Flea market. 9. We have run out of sugar. Could you spare me some? 10. It's the best picture I have ever taken. II. It has been windy all day. 12. Nick has chosen a story by William Somerset Maugham for his home reading report. 13. I haven't seen anything interesting lately. 14. Have you checked your voice mail today? 15. They will make the decision after they have interviewed all the applicants. 16. It has been a pleasure to be of assistance. 17. I have always believed that she will come back one day.