set off doing还是to do

set off 后只加动名词，set sb off doing sth.使某人开始干某事。

set off 动身，出发，启程；

Her imitations always set us offlaughing.她模仿别人的动作，每次都把我们逗笑。

lt set off a chain reaction in the international money markets.这一事件在国际金融市场上引起了连锁反应。

They set off into the country's uncharted interior.他们出发前往这个国家人迹罕至的内陆。

They were going to set off in the fog, but were dissuaded.他们原打算在雾中出发，但被劝阻了。

We set off at a smartish pace.我们快步出发了。

He set off jauntily, whistling to himself.他吹着口哨神气活现地出发了。

She gave a hurried wave and set off across the grass她匆匆地挥了挥手便穿过草地离开了。

Her parents kissed her goodbye as she set off from their home她动身离开父母家时父母和她吻别。