i stopped reading the book when my mother asked me to have supper.
当妈妈叫我去吃晚饭时,我停止了读书.
i was watching TV just now.When i heard my mother came into the room,i stopped to read my book.
刚刚我在看电视,当听到妈妈走近房间时,我马上停下来,然后去做作业了.
通常来说,stop doing A 是指停下手中正在做的事情（A事情）
stop to do A 是指停下做之前的事,做另一件事,就是A 的那件事