want一般加上to再接动词, I want play basketball应该是 I want to play basketball
want to do sth 想做某事 想要做某事 想要作某事
want doing sth 需要做...
want sth/sb想要某物/人
want sb do sth 希望某人做某事
想要做某事用want to do sth
所以是 I want to play basketball
不对。。是want to do sth.
eg:I want to play basketball.
He wants to play the violin.
I want to play basketball。