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例: turn it up, turn them down be able to/can:均可表示“某人有能力去做某事”,可以互換使用,但 can只有兩種形式:can(現(xiàn)在時(shí) )和 could(過(guò)去時(shí) ),而 be able to可 No one could answer the question.=No one was able to answer the question. He can speak in Japanese.=He is able to speak in Japanese. I’m sorry I haven’t been able to finish the work.對(duì)不起,我一直沒(méi)能完成這項(xiàng)工作。(3)在 see,hear,watch,feel,notice,look at,listen to等表示感覺(jué)和 let,make,have等表示使役的動(dòng)詞后,不定式作賓語(yǔ)補(bǔ)足語(yǔ)省略 to I often see her go to school on foot. 注意:動(dòng)詞不定式作賓補(bǔ)時(shí)所表示的動(dòng)作為前邊賓語(yǔ)的動(dòng) turn on/turn off/turn down/turn up ① turn on打開(kāi) (收音機(jī)、煤氣、電燈 ……) Turn on the light,’s too dark in the room. ② turn off關(guān)上 (收音機(jī)、煤氣、電燈 ……) Be sure to turn off the light when you leave the room. ③ turn down 把 …… The baby is sleeping,please turn down the radio. ④ turn up把 …… I can’t hear the news,please turn the