Sentences metaphors are used to complete sentences, rather than using it as a part of sentence. Some of the examples of sentences metaphors are:
'Men's words are bullets that their enemies take up and make use of against them.'
'Two moonstones looked up at him.'
'The winds were ocean waves, thrashing against the trees' limbs. The gales remained thereafter, only ceasing when the Sun went down.'
'Life is a wheel.'