Here is an arrangement of another spiritual – All my Trials – arranged for four female voices accompanied by piano, cello and percussion. All the vocal parts are written out. Notice how each vocal part is busy sometimes and silent at other times.
This kind of interplay and imitation is one of the things that makes choral arrangements spellbinding as well as creating drama and dynamics.
This arrangement is in the key of F, with a middle section in D minor. Analyze the score to see how the parts work with the chords. Try learning the parts one by one and try singing them with some friends. Male singers can sing the parts down an octave. Have fun with it! Once you know it well, try experimenting and create your own interpretation.