while 和 as在英語中的用法詳解
while 和 as在英語中的用法詳解
下面是學(xué)習(xí)啦小編整理的一些關(guān)于while 和 as在英語中的用法,歡迎大家閱讀!
while 用作連詞時(shí),有以下幾種含義:
1.意為“雖然,盡管”,引導(dǎo)讓步狀語從句。例如:While it was late, he went on working. 雖然很晚了,但他還在繼續(xù)工作。)2. 連接兩個(gè)并列句子,表示“對(duì)比”關(guān)系。例如:He went out for a walk,while I stayed at home.他出去散步了,而我卻呆在家里。)3.while 引導(dǎo)狀語從句時(shí),應(yīng)注意以下幾點(diǎn): 1. )while 引導(dǎo)的時(shí)間狀語從句既可放在句首,也可放在句末;而 while 引導(dǎo)的讓步狀語從句一般放在句首,不放在句末。另外,也可以從意義上加以區(qū)分。例如:
While he was tired, he went on working. (雖然他累了,但他還是繼續(xù)工作。) ( while 引導(dǎo)讓步狀語從句)
While he was tired, he would have a rest. (他累了就休息一會(huì)兒。) ( while 引導(dǎo)時(shí)間狀語從句)
2.)while 和 when 都可以引導(dǎo)時(shí)間狀語從句,但應(yīng)注意: while 引導(dǎo)的時(shí)間狀語從句中的謂語動(dòng)詞必須是延續(xù)性的動(dòng)詞;而 when 引導(dǎo)的時(shí)間狀語從句中的謂語動(dòng)詞既可以是延續(xù)性動(dòng)詞,也可以是非延續(xù)性動(dòng)詞。當(dāng)時(shí)間狀語從句中的謂語動(dòng)詞是延續(xù)性動(dòng)詞時(shí), while 和 when 可以互相替換。例如:
While we were talking, the teacher came in. (我們正在談話時(shí),老師進(jìn)來了。)
The bus had left when we arrived at the bus stop. (當(dāng)我們到達(dá)車站時(shí),公共汽車已經(jīng)開走了。)
( arrive 是非延續(xù)性動(dòng)詞,因此,此句中的 when 不能用 while 替換。)
When / While we were having a meeting, our teacher came in. (我們正在開會(huì)時(shí),老師走了進(jìn)來。)
( have 是延續(xù)性動(dòng)詞,因此,句中的 when 可以用 while 替換。)
4. while 引導(dǎo)的狀語從句還可以表示“某個(gè)動(dòng)作正在進(jìn)行的同時(shí),另一個(gè)動(dòng)作也在進(jìn)行之中”。例如:
While the teacher was speaking, the students were listening. (老師講課時(shí),學(xué)生們?cè)诼牎?
as作連詞的用法
1. as...as的用法 as...as意為"和……一樣",表示同級(jí)的比較。使用時(shí)要注意第一個(gè)as為副詞,第二個(gè)as為連詞。其基本結(jié)構(gòu)為:as+ adj./ adv. +as。例如: (1)This film is as interesting as that one.這部電影和那部電影一樣有趣。
其否定式為not as/so +adj./ adv. +as。例如: This dictionary is not as/so useful as you think.這本字典不如你想象的那樣有用。 若有修飾成分,如twice, three times, half, a quarter等,則須置于第一個(gè)as之前。例如:
Your bag is twice as expensive as mine.你的袋子比我的貴一倍。
2. as用作連詞引導(dǎo)時(shí)間狀語從句,用as時(shí),主句和從句的動(dòng)作同時(shí)發(fā)生,強(qiáng)調(diào)伴隨具有延續(xù)的含義。例如:
(1) You will grow wiser as you grow older.你會(huì)隨著年齡的增長而越來越聰明。
3. as用作連詞引導(dǎo)原因狀語從句 as一般放在句首,語氣較弱,較口語化(1) Since you are so sure of it he’ll believe you.既然你對(duì)此如此有把握,他會(huì)相信你的。 As rain has fallen, the air is cooler.因?yàn)橄逻^雨,空氣比較清爽。
4. as作連詞引導(dǎo)讓步狀語從句 ,as含義是"雖然,盡管",所表示的語氣較強(qiáng),引導(dǎo)的讓步狀語從句用倒裝語序
Strange as it may seem, nobody was injured in the accident.這次意外雖然顯得令人不可思議,卻沒有人受傷。
二、as作關(guān)系代詞的用法 關(guān)系代詞as引導(dǎo)定語從句時(shí),既可以單獨(dú)使用,也可以與其他詞連用,
1. as引導(dǎo)定語從句與其他詞連用
?、儆糜趖he same...as結(jié)構(gòu)中
This is the same book as I read last week.這本書和我上周讀的那本是一樣的。
?、谟糜趕uch...as結(jié)構(gòu)中 I don”t like such books as he recommends.我不喜歡他推薦的那些書。
?、塾糜?quot;so +adj. + a/an + n. (單數(shù)) + as "結(jié)構(gòu)中 I am not so strong a man as I was.我已經(jīng)沒有從前那么強(qiáng)壯了。
2. as單獨(dú)引導(dǎo)定語從句 as單獨(dú)引導(dǎo)定語從句時(shí),先行詞可以是一個(gè)詞,也可以是一個(gè)句子或短語。例如:
She is late, as is often the case.她遲到了,這是經(jīng)常的事。(先行詞是整個(gè)主句)
She cooks as well as her mother does.她燒菜燒得跟她母親一樣好。
(2) To shut your eyes to facts, as many of you do, is foolish.對(duì)事實(shí)視而不見--你們好多人都是如此的愚蠢。(先行詞是不定式短語)
三、as作介詞的用法 as作介詞,意思是"作為","以……身份"。例如:
He came to China as a tourist five years ago.他五年前以游客的身份來過中國。
四、as作副詞的用法 "相同地","同樣地"。例如:
They don’t have as many airplanes.他們沒有同樣多的飛機(jī)。