Помогите, пожалуйста!!!!!

1. I have never been to the USA. I wanted to go there last summer but I couldn’t. 

2. He has lived in this street all his life.

3. His father came back to London last Sunday. 

4. Yan wrote a letter to Nick two days ago. 

5. He sent his letter yesterday. 

6. They have just bought some postcards.