noise/voice/sound1、noise/voice/sound這三個詞均指“聲音”voice 是可數(shù)名詞，指人發(fā)出的聲音。如：i didnt recognize johns voice on the telephone. 在電話里我沒聽出約翰的聲音。we could hear the childrens voices in the garden. 我們能聽見花園里孩子們的聲音。sound 詞意最廣泛，它包括各種性質(zhì)的聲響，不論大聲還是小聲，音樂或噪音，有意義的還是無意義的聲音均可，多作可數(shù)名詞。如：a joyful sound came from the distance. 遠(yuǎn)處傳來歡快的聲音。the door was open, and the sound came from the kitchen. 門開著，聲音是從廚房傳來的。noise 泛指一切在的、雜亂的或令人討厭的雜聲和吵鬧聲，既指單一的刺耳、尖銳、磨擦的聲響，也可指混合在一起不協(xié)調(diào)的聲響，不論是由人或物所發(fā)出的，可以是可數(shù)的，也可以是不可數(shù)的。如：loud noise can make people ill. 大的噪音能使人生病。dont make such a loud noise. 別弄出這么大的聲響。2、necessarynecessary主要用于兩種句型：its necessary for sb. to dosth. 某人有必要做某事its necessary that 有必要注意：that從句中謂語用should + 動詞原型，should 可省略。另外：不能使用sb. is necessary to do 結(jié)構(gòu)，因為通常是“某事或做某事有必要”，而非人有必要。誤：he is necessary to return home this afternoon.正：its necessary for him to return home this afternoon.漢譯英他有必要改進(jìn)自己的學(xué)習(xí)方法。有必要的話，我們可以多雇幾個人收莊稼。key:its necessary for him to improve his method of study。/its necessary that the should improve his method of study。if necessary,well employ more men for the harvest.3、常見的總括詞有：both/all/every/everyone/everybody/everything/everywherenot all of them go in for sports. 他們并不都喜歡運(yùn)動。相當(dāng)于：all of them dont go in for sports.或：some of them go in for sports,but others dont.i dont like both of the novels. 這兩部小說我并不都喜歡。相當(dāng)于:i like only of the novels.you cant get this kind of vegetables everywhere. 這種疏菜你并不是在哪里都能買到。相當(dāng)于：you can only get this kind of vegetables somewhere.如果表示全部否定則應(yīng)用：neither(兩者)/none(多者)/no one/nobody/nothing/nowhere.none of them go /goes in for sports. 他們都不喜歡運(yùn)動。i like neither of the n