Use the present perfect or the past simple tense

1. I (meet) two of my friends today. I (meet) them on my way to the university. 2. A month ago my uncle (build) a new house in the country. We (to visit) it recently. 3 I never (to hear) this story of my father. 4 She (to be ill) last week. 5. He (forget) to close the window when he (leave) the house. 6. When the concert (to begin)? 7. It is cold today. The weather (to change) since yesterday. 8. My mother not (to come) home yet. 9. His brother not (to go) to the university yesterday. 10. Where (to be) you last night. 11. I cannot give you this book as I (to give) it to Ann. - When yoy (to give) it to her. 12. I (not to come) to you yesterday because i (to be) very busy. 13. I (to see) Ann on Wednesday. 14. When you (to write) a letter to your friend? - I (to write) to him last week.