set off:出發(fā),側(cè)重于去某個(gè)地方 例句與用法:If you want to catch that train we'd better set off for the station immediately.你要是想趕上那班火車,咱們就最好馬上動(dòng)身去火車站.They've set off on a journey round the world.他們已經(jīng)開始環(huán)游世界.set out:出發(fā),開始,側(cè)重于開始做某事,還有規(guī)劃,展現(xiàn)的意思 例句與用法:They succeeded in what they set out to do.他們打算做的事已經(jīng)做成了.set about:開始,著手,與set out意思相近,但set out后加不定式,即set out to do sth,而set about后加 ing形式,即set about doing sth.例句與用法:1.You must set about your work at once.你必須立即開始工作.2.Do you know how to set about going on this work?你知道怎樣著手進(jìn)行這項(xiàng)工作嗎?