noise/voice/sound1、noise/voice/sound这三个词均指“声音”voice 是可数名词，指人发出的声音。如：I didn’t recognize John’s voice on the telephone. 在电话里我没听出约翰的声音。We could hear the children’s voices in the garden. 我们能听见花园里孩子们的声音。sound 词意最广泛，它包括各种性质的声响，不论大声还是小声，音乐或噪音，有意义的还是无意义的声音均可，多作可数名词。如：A joyful sound came from the distance. 远处传来欢快的声音。The door was open, and the sound came from the kitchen. 门开着，声音是从厨房传来的。noise 泛指一切在的、杂乱的或令人讨厌的杂声和吵闹声，既指单一的刺耳、尖锐、磨擦的声响，也可指混合在一起不协调的声响，不论是由人或物所发出的，可以是可数的，也可以是不可数的。如：Loud noise can make people ill. 大的噪音能使人生病。Don’t make such a loud noise. 别弄出这么大的声响。2、necessarynecessary 主要用于两种句型：① It’s necessary for sb. to do sth. 某人有必要做某事②It’s necessary that… 有必要……注意：that 从句中谓语用 should + 动词原型，should 可省略。另外：不能使用 sb. is necessary to do 结构，因为通常是“某事或做某事有必要”，而非人有必要。误：He is necessary to return home this afternoon.正：It’s necessary for him to return home this afternoon.汉译英① 他有必要改进自己的学习方法。② 有必要的话，我们可以多雇几个人收庄稼。Key:①It’s necessary for him to improve his method of study。/It’s necessary that the should improve his method of study。②If necessary,we’ll employ more men for the harvest.3、常见的总括词有：both/all/every/everyone/everybody/everything/everywhere①Not all of them go in for sports. 他们并不都喜欢运动。相当于：All of them don’t go in for sports.或：Some of them go in for sports,but others don’t.②I don’t like both of the novels. 这两部小说我并不都喜欢。相当于:I like only of the novels.③You can’t get this kind of vegetables everywhere. 这种疏菜你并不是在哪里都能买到。相当于：You can only get this kind of vegetables somewhere.如果表示全部否定则应用：neither(两者)/none(多者)/no one/nobody/nothing/nowhere.①None of them go /goes in for sports. 他们都不喜欢运动。②I like neither of the novels. 这两部小说我都不喜欢。③You can get this kind of vegetables nowhere. 在哪里你也买不到这种疏菜。
