I was in London last year.

• → I went to London last year.

2. She was at home yesterday.

• → She stayed at home yesterday.

3. Noah worked in Singapore 3 years ago.

• → Noah worked in Singapore for 3 years.

4. Tung studied in Russia for 5 years.

• → Tung studied in Russia for 5 years.

5. There were a lot of candies here yesterday.

• → There were a lot of candies here yesterday.

6. My father didn’t go to America last month.

• → My father didn't go to America last month.

7. Did you have any exams last week?

• → Did you have any exams last week?

8. They did housework last Sunday.

• → They did housework last Sunday.

9. I was at school this morning.

• → I went to school this morning.

10. We had an English class this morning.

• → We had an English class this morning.

11. I bought a new computer last month.

• → I bought a new computer last month.
  •  

12. My brother bought me a new guitar last Christmas.

• → My brother bought me a new guitar last Christmas.
  •  

13. George didn’t sleep well last night.

• → George didn't sleep well last night.