Final answer:
The sentence in question has two structural ambiguities related to whether Susan used binoculars or if the man was holding binoculars.
Step-by-step explanation:
The sentence 'Susan saw a man with binoculars' contains two structural ambiguities. The first ambiguity is whether Susan used binoculars to see a man. Alternatively, the second ambiguity is whether the man Susan saw was holding binoculars. These ambiguities arise from the placement of the prepositional phrase 'with binoculars,' which can modify either the verb 'saw' or the noun 'man.'