The subject is not always the performer of the action; it is sometimes the receiver of the action.
Wǒ de chē xiū hǎo le。
My car has been fi xed.
(车 does not perform the action of 修.)
 Yip, P. C., Rimmington, D., Xiaoming, Z., & Henson, R. (2009). Basic Chinese: a grammar and workbook. Taylor & Francis.
 Teng, W. H. (2016). Yufa! A practical guide to Mandarin Chinese grammar. Taylor & Francis.