英语教案-American English
从词义上看,三词相近,均表示上下文之间语气的转折,其中but语气强烈,译作“但是”;从词性上看,however作“然而、可是”解时是副词,而but与while是连词,用于连接并列分句;从句子位置看,but与while一般位于两个并列分句的中间,however位置灵活,可位于可首,句中或句尾,而且必须用“,”与句子分开。例如:
We love peace, but we are not afraid of war.
This plan is all right; however, it can be made better.
I’m interested in sports while my brother is fond of music.
He is young, but he knows a lot. 他尚年幼,但懂得却多。
Later, however, he decided to go. 可后来他决定去了。
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3.A great many words and expressions have come into the language from American English…
英语中表“许多”的词组有很多,一般可按其用法分为以下三类:
修饰可名词:many; a great (good, large ) number of; quite a few; numbers of; many a ; a great (good) many; scores of 等。many a ,其意近似于many , 但many a 后边接可数名词单数,如:
Many a student has such a question.
修饰不可数名词:much; a great (good ) deal of; a large amount of; large amounts of等。
既可修饰可数名词,也可修饰不可数名词:a lot of (lots of ); plenty of; a large quantity of; large quantities of 等。
plenty of, a lot of / lots of常用在肯定句中,否定句中多用many或much 。如:
Today I haven’t much work to do. 今天我没有许多事做。
4. Now ask your partner for the answers.
句式“ask + 名(人)+ for +名”意为“向(某人)请求……”;“向(某人)要求……”,例如:
He asked his parents for a motorcycle.
比较下列句式:
句式一:ask +for+名,向……要,例如:
After dinner I asked for coffee.
句式二:ask +名(+ for/to+ 名), 请……,例如:
I have been asked for (to) dinner tonight.
句式三:ask + 名(人)+副词+for / to + 名,请……,例如:
He asked me in for a cup of coffee.
I asked her out to lunch.
句式四:ask for + 人,要求(人)来(接电话),例如:
A Mr Simpson from Sydney is asking for the manager.
5.as用法小结
1)as用作介词,意为“作为”,“如同”。as引导的介词短语大多作状语,有时也可用作定语、定语补足语等。例如:
(1)It was Paul’s first important lesson as a student of Chemistry and he never forgot it.
(2)Dont treat me as a child. 别把我当小孩看待。
(3)He is well-known as a writer. 作为一名作家他很出名。
2)as作连词,有以下几种不同含义:
a. 引导时间状语从句,意为“当……时候”,“随着……”“一边……一边……”。如:
He saw his daughter as he was getting off the bus.
他下车看见了他的女儿。(两个短暂动作几乎同时发生)
b. 引导原因状语从句,意为“因为”,“既然”,as = since(语气比because弱)。as原因状语从句多位于主句前。如:
(1)As (Since) you are not feeling well, you may stay home.
既然你不太舒服,你就留在家里吧。
(2)As he was ill, I went without him. 因为他有病,我独自去了。
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