ask sb. for sth = ask sb. to do sth
ask for 有索要,请求的意思 比如
ask for a heip 就是请求帮助
ask sb to do sth是让某人做某事的意思.
I can't answer this question , so I plan to ask my teacher for help.(我无法回答这个问题,所以我打算向我的老师寻求帮助.)
I can't answer this question , so I plan to ask my teacher to help me.(我无法回答这个问题,所以我打算让我的老师来帮助我.)
