Answer:
Emphasize Tubman's strength and determination.
Step-by-step explanation:
This is most likely the reason why Greenfield uses nonstandard English in "Harriet Tubman." In this text, Greenfield wants to show the character that Tubman displayed in her life. We learn how determined she was to helping others and bringing them to safety and liberty. Greenfield conveys this strength of character and enduring spirit by employing nonstandard English when describing Tubman's speech.