The locative ‘zài’ sentence can also be expanded to specify the existence state of the located object, the pattern is: ‘Located object + zài + NPloc (Reference object) + V-zhe’. For instance:
Nàxiē shū zài dìbǎn shàng duī zhe.
(Those books were piling up on the floor.)
Yéye zài hébiān zuò zhe.
(The grandfather was sitting at the riverside.)
Sòng lái de shuǐguǒ zài zhuōzi shàng fàngzhe.
(The fruit that was delivered here was placed on the table.)
Such sentences, as they give more information about the existence state of the located object, are mainly used for description.
 Loar, J. K. (2011). Chinese syntactic grammar: functional and conceptual principles. New York: Peter Lang.