Read these lines from the poem "The Runaway" by Robert Frost about a colt seeing its first glimpse of snow.
And now he comes again with a clatter of stone,
He mounts the wall again with whited eyes
And all his tail that isn't hair up straight
He shudders his coat as if to throw off flies.
'Whoever it is that leaves him out so late,
When all other creatures have gone to stall and bin,
Ought to be told to come and take him in.'

What effect is created by the poet's use of verbals?