Będę wdzięczna za pomoc.
New research showed that radiation from the phones can damage your brain.
W tym zdaniu wybrałam showed. Może poprawne będzie has shown ?
Tom, the famous basketball star, has announced his retirement at the end of next month.
Tom has been playing professional basketball for 4 years. Since he started his career he has made an estimated $20 million in sponsorship deals.
Dzięki !