Activities are durative and dynamic. They go on for an indefinite period of time with no inherent endpoint or goal, so they do not finish but terminate or stop, thus they have an open range with only an initial end in their temporal schema:
I - - - - - - - - Farb
In the schema, ‘I’ represents the initial point of an action; the broken line represents successive stages. The ‘Farb’ is an arbitrary endpoint where the action stops. Examples of Activities are ‘zǒu’ (walk), ‘pǎo’ (run), ‘chī’ (eat), ‘gōngzuò’(work) ‘xuéxí’ (study), etc.
 Loar, J. K. (2011). Chinese syntactic grammar: functional and conceptual principles. New York: Peter Lang.