What are syntactic functions of -ed participle? Give an example.

What are syntactic functions of -ed participle? Give an example.
【正确答案】：The -ed participle can perform a variety of grammatical functions: part of the verb phrase to form the perfective aspect or the passive voice, premodifier in the noun phrase, postmodifier as a subject complement or an object complement, etc. For example:a broken window/ She looked depressed./ I feel very impressed./ make yourself heard.