In context, lines 27-29 ("They gave tongue ... for want of utterance") primarily reflect the author's O innate understanding that slavery is wrong
O developing arguments against slavery
doubts about deeply held beliefs
fears about being enslaved for life
O inability to verbalize thoughts and feelings

Acquiring english is a way of learning where you learn english by birth, this includes listening to your parents, brothers and sisters and on the whole learning it from the environment around you while mastering standard english need qualified institutes and teachers who make certain programs and syllabus to you master the standard english. this also can include a long session of academic studies before you can master the standard english.standard english is necessary for literary works, official usage and writing materials for standardized publications or when someone needs to speak publicly. in most cases the employers of a company also demand and like the use of standard english from their employees. 

Well where is the passage!