今天小编为大家介绍一下ACT介词(Over、Off、as)的用法。

　　介词

　　介词在英语中一直扮演者中介和连接的角色，介词虽少，但在表达句子意思上一直发挥着不可忽视的作用。同样，在 ACT English 考试中，介词也是 ACT 考察的一个重点，一般来说，ACT 主要考察句中介词的准确性。

　　Over用法

　　1)介词

　　在...的上方

　　= above or higher than sth, whithout touching

　　e.g. a book hung over the desk

　　覆盖在...的上面

　　= On sth or covering sth.

　　e.g. she wears a coat over a sweater

　　2)形容词

　　倒下(的)

　　E.g. knock the candles over

　　结束

　　E.g. the affair is over

　　3) 副词

　　A) E.g. fall over

　　(fall over是向前摔倒;fall down没有向前的含义，指的是摔下来，比如fall down from the tree)

　　B) 越过;经过

　　E.g. Fly over

　　C) E.g. Come over

　　(come over 意思比较多，大概可以归纳为：

　　1.在上方经过 (意思同上fly over)

　　e.g. planes are coming over all the time.

　　2. 过来; 从远处来

　　Come over! Here's a seat for you.

　　3. 顺便来访

　　You really must come over sometime and have dinner with us.

　　4. 被理解并完全接受; 被通过

　　Did his speech come over?

　　5.逐渐变得

　　The sky came over dark as a thick cloud passed before the sun..

　　6.突然感到

　　She suddenly came over dizzy and had to lie down. ) D) 弯折;弯腰e.g. bent over ; Fold the paper over E) =throughout an area/time/body... E.g. all over the world Be happy over the weekendThe flower is watered all over.

　　Off 的用法

　　1)副词

　　A 离开;离去 = away from a place

　　e.g. drives off at 5 o’clock

　　turn off to a side road

　　B 移开;剥离

　　e.g. break off a piece of orange

　　C 清除

　　e.g. pay off the bills

　　D 取消;停止

　　e.g. Call off the meeting

　　e.g. Turn off the light

　　2)介词

　　A 从某物上移开、剥离;偏离

　　e.g. Keep off the grass.

　　His hat fell off the head.

　　get off a bus

　　discuss off a topic

　　B 不再喜欢; 不再使用

　　e.g. I feel much better and take myself off the medicine.

　　I am off books now.

　　C 下班

　　e.g. off work

　　D 低于;折扣

　　e.g. 30% off the price shown

　　E 表示距离

　　e.g. The city is a mile off.

　　3)形容词

　　A 有失水准的;发挥不好的;萧条的

　　e.g. an off day

　　an off season

　　B变质

　　e.g. The food has gone off

　　C 休假

　　Take one day off

　　D 切断的;断电的、没电的

　　e.g. The electricity is off.

　　The phone is off

　　4)名词

　　A 开始;出发

　　e.g. She is ready for the off.

　　5) 词组搭配用法

　　A be well/badly/better off

　　表示经济状况比较好/坏

　　e.g. Employees will be better off with a new boss coming in.

　　B be better/worse off

　　表示总体情况会变好/坏

　　e.g. I will be better off without you.

　　C be off for sth

　　某物还剩…

　　e.g. How are we off for the water?

　　D on and off

　　=from time to time

　　不时地;时常地

　　e.g. She played music on and off all day.

　　as的用法

　　1)介词

　　=作为

　　e.g. He came to China as a tourist five years ago.

　　As a young adult, he used to stay up late.

　　2)连词

　　a) =当…的时候

　　e.g. You will grow wiser as you grow older.

　　注意：区别于when，when引导的时间状语从句的动作可以与主句的动作同时发生，也可以先于主句的动作发生;as强调主句和从句的动作同时发生.

　　b) =因为，由于

　　e.g. As rain has fallen, the air is fresher.

　　注意：区别于because & since： because表示的语气最强;as一般放在句首，语气较弱，较口语化;since常常用在书面语中，表示多为对方已知的、或稍加分析便可得知的原因，有时可译作"既然"。

　　对比：He will succeed because he is so hard-working.

　　Since you don’t earn much money from part time job, you should not make the purchase.

　　c) =尽管

　　Strange as it may seem, nobody was there when the accident took place.

　　注意：区别于although：although语气稍正式些，主句中不能再用but，但可以用yet;as所表示的语气较强，引导的让步状语从句用倒装语序。

　　对比：Although he is quite old, he still jogs every day.

　　d) =像;正如

　　e.g. Please offer them help, just as they supported you.

　　Do as a I say.

　　3)副词

　　=equally(同样地)

　　e.g. They don”t have as many airplanes.

　　特别注意：as...as意为"和……一样"，表示同级的比较。使用时要注意第一个as为副词，第二个as为连词。其基本结构为：as+ adj./ adv. +as。

　　e.g. This story is as interesting as that one.

　　His pen writes as smoothly as mine.

　　4)代词

　　作为关系代词，引导定语从句

　　e.g. This is the same book as I read last week.

　　I don’t like such a man as she always mentions.

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