as的用法归纳知识讲解

2. 引导原因状语从句
because 语气最强, 用于回答why 提出的或人们不知道的问题； as，一般放句首，语气弱，口语化，说明比较明显的原因； since书面语中，表对方已知的、或稍加分析便可得知的原因，
有时译作“既然”。 for 表附加的解释、说明或推理。不放句首
I do it because I like it. He didn’t go to school because he was ill. Since many of the customers work during the day, Billy
as用法归纳
adv.
引导时间状语从句 引导原因状语从句
conj.
引导让步状语从句
引导方式状语从句
as
prep.
引导比较状语从句
pron.
引导定语从句
固定用法
PRACTICE
1.引导时间状语从句
区别 连词
时间
与主句谓语动 作
whe n
Hale Waihona Puke Baidu点、段
先于、同时发生
只用as
while 段、过程
过程中、同时发 生
4. 引导方式状语从句，
“如”，“像”，“按照……的方式 I want you to tell my friend your very
interesting experience exactly as you have told it to me. 我想让你像给我讲述的那样，给我的朋友讲一讲你那段 极其有趣的经历。 Remember, you must do everything as I do. 记住，你必须按照我做的那样做一切。 注意：like在非正式语体中可以有与as相同的用法. I can’t sing like I used to. 我不能像以前那样唱歌了。 He writes just like his brother did when he was young. 他现在写文章正像他哥哥年轻时写文章一样。
He looked behind from time to time as he went forward.
当他朝前走时，不时地向后看。 As time went on / by, she became more a
nd more worried. 随着时间的流逝，她变得越来越焦虑。 As he grew older, he became more
as
当…的 时候
同时进行
① 同一个人的两种动作交替进行, “一边…,一边…”。
② 两个同步发展的动作或为,
“随着”
③ 表示两个短促行为或事件几乎 同时发生。
John was having his dinner when I saw him.
当我看到约翰的时候，他正在吃饭。 She can write only when the baby is
注意：当as引导让步状语从句时，句子的倒装语序有以下三种形式： (1). 形容词或副词+as+主语+连系动词be或实义动词。例如： Rich as he is, he never spends a cent on clothes. Much as I admire his courage, I don’t think he acted wisely. (2). 名词+as+主语+连系动词be (注意句首的名词不带冠词)。 Child as he is, he knows a lot. Boy as he was, he was chosen king. 。 (3). 实义动词+as+主语+助动词 Try as he may, he never succeeds. Change your mind as you will, you will gain no additional support.
intelligent. 随着他年龄的增长，他变得更有才智了。 I thought of it just as you opened your m
outh. 恰好在你开口时，我想到了它。 Just as the flying worm hit her face, she g
ave a loud cry. 恰巧在飞虫撞到她脸上时，她大哭起来。
5. 引导比较状语从句
,用于“as...as...或not so/ as...as...”中,前一个as是副 词,后一个as是连词， “如(不如)…一样”。
3. 引导让步状语从句
“虽然，尽管”， although语气稍正式些，可放在句首，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； however引导让步状语从句时，后面可跟形容词或副词，也要用倒装语序。
Although they are poor they are happy. Angry as he was, he managed to speak calmly. However hard the question is, he can answer it.
asleep. 只有婴儿睡着的时候，她才能写作。 We must strike while the iron is hot. 趁热打铁。 While we were reading, the teacher came
in. 我们正在读书的时候，老师走了进来。 The girl dances as she sings on the stage.
has to collect the money at night. As he is a League member, he takes the lead in
everything in his class. As she has been ill perhaps she‘ll need some help. It must have rained last night, for the ground is wet.