Witaj :)
1. Poprawne, lecz można użyć grzeczniejszego zwrotu can -> could
2. Harry and Tom want me to buy some lollipops for them.
3. Poprawne
4. Poprawne
5. She is one of my friends
6. Ann arrived in Germany in June.
7. Poprawne. Alternatywa: Could you please speak louder?
8. He received the last letter on January 9th.
9. Let's go swimming tomorrow afternoon.
10. Don't listen to her, she is telling lies.
Jeśli jest jakiś błąd to przepraszam.