okay, for a, they all begin with En - enable, encircle, encourage.. ect.
for b, they all begin with be- befriend, behead, beseige,ect.
for c, They end with En. blacken, brighten, ect.
for d, they all end in "ly", beautifully, certainly.. ect.
and e, they all end with "ize" - customize, dramatize, ect.
Hope that helps!
