3.7.4词根usu=use用处，使用【p58】

unusual [ʌn'ju:ʒuəl] a. 不平常的，异常的  【usual ['ju:ʒuəl] a.平常的，通常的】

usual['ju:ʒuəl] a.平常的，通常的【usu=use用，e异化为u，-al形容词后缀；“用途平常的”】

usually ['ju:ʒʊəli] ad. 通常，平常【uaual平常的，-ly副词后缀】

utility [ju:'tiliti] n. 效用，使用；（pl.） 实用品，公用事业 【util=use用，-it名词后缀；“有用的物品”】[四级]

utilize [ju:'tilaiz] v. 利用【util=use用，-ize动词后缀】[四级]

【经典例句】

1.It's unusual for him to refuse a drink. 给他酒他不喝, 这事可新鲜.

2.As is usual with children, they soon got tired. 孩子们一贯如此, 他们很快就厌倦了.

3.What do you usually do on Sundays? 你星期天通常做什么?

4.Our rent is $ 300a month, plus utilities. 租金是每月三百元，包括水电费.

5.Water is utilized for producing electric power.水可用以发电.

6.She is unfit for such a senior position. 她不胜任这种高级职务.

7.He keeps himself fit by running 5 miles every day. 他每天跑五英里以保持身体健康.

8.It takes quite a bit of time to get from London to Glasgow. 从伦敦到格拉斯哥要花很多时间.

9.She hit him on the head with a book. 她用书打他的头.

10.She knitted her son a sweater. 她给儿子织了一件毛衣.

11.A fall into the pit,a gain in your wit.吃一堑，长一智.

12.She sat (down) on the chair and took her shoes off. 她坐在椅子上, 把鞋脱了.

13.I needed time to gather my wits before seeing him again. 我需要先镇定一下才能再次见他.

14.When his ex-wife arrived at the party he made a swift exit. 在聚会上, 他的前妻来到时, 他匆匆离去.

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