1.stop doing 停止正在做的事情
EG：Stop talking ,let's begin our class .
2. stop ... (from )doing 阻止某人做某事
EG：It's cold outside .Stop him from going out .
stop doing 是停止正在做的事情 stop from doing 是阻止某人不让他做某事
前者是“停止正在做的事”；后者是”阻止...做某事“
stop doing 停止做某事stop somebody from doing阻止某人做某事
stop doing停止做某事
The two girls stopped talking when they saw me.
stop from doing表示“阻止…不做某事”，from 可省略。
We must stop him( from )going to swim in the river.
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