Ответ:
1. you arrived in England las week ( last week - маркер Past Simple)
2. My mum studies Russian at university (Present Simple - просто факт)
3. I phoned you yesterday, but you weren't at home (Yesterday - маркер Past Simple)
4. Last night, Marga and Alice were planing their holiday (last night - Past + процесс )
5. Tom has ivited us to his birthday party (Present Perfect - результат на момент речи)
6. The children have carried the books to the classroom (Present Perfect - результат на момент речи)
7. We finished the exam at half past three (Past Simple - кокретный момент в прошлом )
8. I am chatting to Jane about films and facion (Present Continious - процесс в момент речи )