When communicating in Chinese you may often make mistakes using Chinese grammar like:

False:

    她想想学会打球。

    Tā xiǎnɡxiǎnɡ xuéhuì dǎqiú

True:

   她想学会打球。

   Tā xiǎnɡ xuéhuì dǎqiú.

句中“想”做能源动词用。能源动词的语法特点之一是不能叠用，应当把“想想”改成“想”。

想 in the present sentence functions as an auxiliary verb which can not be reduplicated by characterisitic. One ought to substitute 想想 with a single 想.