she wants to do sth.中do是不是用原型

绝对是
如make sb to do would like to do
It's adj to do
Remember to do stop to do Like to do
Forget to do be afraid to do be afraid to do seem to do/be
need to do
keep doing
enjoy doing
agree to do sth.
start to do sth.
continue to do 继续做某事
try to do 尽力做某事
to do sth 表示要去做某事，还没做。doing sth 表示正在做某事，动作正在进行。要休息区别。

是

是 这个用V啊，既是动词原形