usually/ sometimes/ never
Ⅰ. 这几个词都是表频度的副词，它们之间的区别可用百分比来区分：
(0%)→(20%)→ 70%)→(75%)→(100%)
从不 —→ 有时 —→ 时常 —→ 通常 —→ 总是
即：never(0%)→sometimes(20%)→often/frequently(70%)→usually(75%)→always(100%)
Ⅱ always “永远、总是”。与进行时连用时，表“再三地、老是”等意思。有时还表“生气或不耐烦”等盛情色彩。如：
① The sun always rises in the east.太阳总是从东方升起。
② I always get up at seven o’clock. 我总是在七点钟起身。
③ The boy is always asking whys.这男孩老是问这问那没个完。
Ⅲ often “时常、常常”强调经常性。如：
① He often comes here to see me. 他时常到这儿来看我。
② We have often been there.
Ⅲ frequently “时常、屡次”常与often 通用。但它强调次数频繁。如：
① Business frequently brings him to Shanghai.他时常因事到上海去。
② He frequently comes here to see her.他时常到这儿来看她。
Ⅳ usually “经常”其动作频率仅次于always.常常与一般过时，一般现在时连用。
① I usually get up at six in the morning.
Ⅴ never “从不”是否定副词。常常与完成时连用。
① I have never been to the Great Wall.
② She said she had never gone there.频繁ten uently "es here to see me. t.uently(70%)→usually(75%)→always(100%)
§32 edge / side
Ⅰ.edge侧重于指很窄的 “边缘”, 如刀刃或沿边的一部分.如:
Put some salt on the edge of your plate. 在你的盘子边上放些盐.
Ⅱ.side “边, 旁边” 有时与edge同义,有时指 “(东西的)侧面”, “(一个)方面”, “(身体的)侧边”,如:
§33 among/ between/ in the middle of
Ⅰ. among “在……之中/中间” 指三者或三者以上。通常表某个范围。如：
① Someone is wrong among us. 我们中间有人错了。
② There is a small village among the mountains. 大山之间有座小村庄。
Ⅱ. between “在…之间”指在二者之间，有时与and 连用。如：
① There is a river between us. 在我们两人之间有一条河。
② I’m standing between a house and a big tree. 我站在一座房子和一棵大树中间。
Ⅲ. in the middle of “在……中间”指在某事物中间，强调事物的两端的中间。如：
There is a bus stop in the middle of the road. 在这条公路中间有个车站。
§34 animal/ beast
Ⅰ. animal “动物” 是区别于植物而言，是动物的总称，通常指兽、鸟、虫、鱼等。如：
① It’s an animal of monkey kind. 这是一种属于猴类的动物。
② The animal is hungry. 这个动物饿了。
Ⅱ. beast “四足动物”通常指不包括爬行动物的较大的四足动物。如：
① The camel is a beast of burden. 骆驼是负重的动物。
② The tiger is a beast of prey. 老虎是猛兽。
§35 another/ other/ more
Ⅰ. 名词前表示具有增加意义的“还、再”，一般用 more 和 another. more放在数词之后，而 another 放在数词之前;有时也可以用 other, 但other具有“不同”之意。保留它本意“别的”。如：
① one more thing, one other thing, another thing都表示“还有一件事”之意，如：
② I want three more / other books. = I want another three books.我还要三本书。
③ I stayed there three more days. = I stayed there another three days. 我在那儿又呆了三天。(这里不用other， 因day与day没有不同之意。
④ We need three more / another three hands to do the job.我们还需要三个人做这项工作。 (这里不用other ， 因不强调人与人的不同。)
⑤ He works on the Great Green Wall with many other people. 他与别的许多人一块在绿色长城上工作。( other 没有增加之意，表除自己以外的别的人。)
