Everybody knows that Christopher Columbus discovered America. Was he really the first to reach the continent? The great Norwegian explorer Thor Heyerdal believed that ancient people were able to build boats that could cross oceans.
Подпишите времена всех глаголов
Knows-Present Simple
Discovered- Past Simple
Reach - (участвует в вопросе, но предложение построено в Past Simple)
Believed - Past Simple
Build - Past Simple