Question

get sb to do sth 和 get sb doing sth有什么区别

Answer 1

get sb to do sth 通常是一次性的，或者是还没有做的事。
I got him to do his homework before dinner.
我让他晚饭前做作业。
get sb doing sth 通常指习惯性动作，经常性的，或者是已经做了的事
It is hard to get him doing his homework before dinner everyday.
想要让他每天晚饭前做作业是很难的。

Answer 2

get sb to do sth 通常是一次性的 get sb doing sth 通常指习惯性动作

Answer 3

不定式指具体做某事或准备做某事，分词则泛指一般性行为。