Question

The teacher stopped to look at him,and he stopped talking at once.

为什么两个stop后面的动词形式不一样，我知道stop to do sth,和stop doing sth.也知道他们的区别是什么，但还是想不明白为什么这样做?

Answer 1

stop
doing
sth
和stop
to
do
sth.
stop
doing
sth是“停止做某事”，doing是stop
的宾语，是要停止的动作，
stop
to
do
sth
是“停下来开始做某事”，to
do是stop的状语，表示目的，是要开始做的事情，例如:
1、The
two
girls
stopped
talking
when
they
saw
me.
那两个女孩一见到我就停止了讲话。
2、The
two
girls
stopped
to
talk
to
me
when
they
saw
me.
这两个女孩一看到我就停下来和我讲我。