Click on the sentence that has an error in verb tense. Harriet Tubman was one important figure in the history of the Underground Railroad. She was a slave herself, but she was able to escape to freedom when she was around twenty-seven years old. Tubman used the Underground Railroad to make her way from slavery in Maryland to freedom in Pennsylvania. However, Tubman soon returned to Maryland and helped her family members escape to freedom. Tubman has traveled along various routes of the Underground Railroad over a dozen times, and she helped many people escape the horrors of slavery.