Question

as的用法

He alleged illness as the reason for his absence.
这个句子是从句么？as 引导的什么从句？
如果是原因状语从句的话，as后面不是应该跟句子么？那就应该是 as the reason is for his absence.

Answer 1

He plays the piano as well as Mary does,前一个as是副词,后一个as是连词,引导比较状语从句,所以比较的东西应该是一样的。不能够拿he plays the piano跟Mary作比较。直接加人名的情况，比如说：She is as beautiful as her sister.

as可以作连词、介词及关系代词。现将其用法小结如下:

一、 as作连词的用法:

1. 作"当……的时候",引导时间状语从句。注意与when、 while的用法区别。

① when作"当……的时候"解,可以指较短的(一点)时间,也可指一段时间。如:

When he was at college, he could speak several foreign languages.

When the clock struck twelve, all the lights in the street went out.

② while常表示一段较长的时间或一个过程,强调主句谓语动词与从句谓语动词同时发生。如:

Work while you work. Play while you play.

③ 但属下列情形时,只用as, 而不用when或while。

A) 用于表示同一个人的两种动作交替进行,指"一边……,一边……"。如:

The girl dances as she sings on the stage.

He looked behind from time to time as he went forward.

B)表示两个同步发展的动作或行为,译为"随着……"。如:

As time went on / by, she became more and more worried.

As children get older, they become more and more interested in the things around them.

C)表示两个短促行为或事件几乎同时发生。如:

I thought of it just as you opened your mouth.

Just as the flying worm hit her face, she gave a loud cry.

D) 后接名词表示某一年龄段时,用as。如:

As a young man, he was active in sports.

2. as=since, 作"既然"、"由于"解,引导原因状语从句,常用来表示已为人们所知或显而易见的原因或理由。如:

As / Since you're not feeling well, you may stay at home.

As he wasn't ready in time, we went without him.

3. as=in the way that, 作"像"、"按照……的方式"解,引导方式状语从句。如:

He speaks English as Americans do.

Remember, you must do everything as I do.

4. 用于as...as...或not so/ as...as...中,前一个as是副词,后一个as是连词,引导比较状语从句。如:

They helped the old man as often as possible.

I don't speak English so/ as well as he does.

5. 作"虽然"、"尽管"解,引导让步状语从句。常用倒装语序,即adj. /adv. / n.+ as +主语+谓语+主句。如:

Tired as they were, they walked on.

Child as he is, he knows a lot. (child前不用冠词)

二、 as作关系代词,引导定语从句,作"正如"、"这一点"解。如:

He is very careful, as his work shows.

As is well-known, Taiwan belongs to China.

as的这种用法,请看2001年的高考题:

is known to everybody, the moon travels round the earth once every month.

A. It B. As C. That D. What

字母下划横线的为正确答案)

另外,当先行词被the same, such等词修饰时,常用as来引导定语从句。如:

Such a clever boy as he can learn anything quickly.

I was reading the same book as he bought yesterday.

三、 as作介词的用法:

as引导的介词短语大多用作状语,as译为"作为";少数情况可引起宾语补足语。如:

As a League member, I'll take the lead in everything. (状语)

She works as a doctor. (状语)

They have me as one of their own children.(引起宾语补足语)

Answer 2

是从句，因为后面有the reason for, 所以 as 引导的是原因状语从句。

Answer 3

as absurd(荒唐) as putting together the pieces of vase
as bare as the back of one hand/a picked bone
as bald(秃) as a coot
as black as coal/ink/jet/midnight/pitch/soot/Styx/
as blind as a bat/beetle/mole
as bold as brass/a lion
as brave as a lion
as bright as a day/noonday/silver
as brittle as glass
as brown as berry
as busy as a bee
as changeable as weather/a clock/the moon
as cheerful as a lark
as clear as a bell/a day/crystal/ daylight/the nose on your face
as close as a clam/an oyster
as common as dirty
as cold as ice/marble/a stone/a cucumber/a key/charity/frog
as cool as a cucumber
as cross as a bear
as cunning(狡猾) as a fox
as dark as pitch
as dead as a door nail/mutton
as deaf as a post/a beetle/an adder
as deep as a wall
as different as chalk from cheese
as distinct as a day and night
as dry as dust/a stick/a bone/a biscuit
as drunk as a lord/a mouth/a sane
as dumb as a statue/an oyster/a fish
as dull as sawdust/cold dish water
as easy as ABC/lying/milking/shelling peas/my eye/an old shoe/going down the river/chasing a cow out of a meadow/pie/anything
as empty as a drum
as fair as a rose
as far as the eye could see
as fat as a pit/butter
as fierce as a tiger
as firm as rock
as fit as a flea/a fiddle
as flat as a pancake/a board
as free as a bird/air
as fleet (swift) as a deer
as fresh as a rose/a daisy
as gay as a lark
as gaudy(华丽) as a butterfly/a peacock
as gentle as a lamb
as good as gold/a play
as graceful as a swan
as grave as a judge
as greedy as a dog/a wolf/a pig
as green as grass
as gruff(粗暴) as a bear
as happy as a lark/the day is long/a king
as hard as flint/marble/a stone/iron/nails
as harmless as a dove
as heavy as a lead
as healthy as the fresh wind
as hoarse(嘶哑) as a crow
as hot as fire/pepper
as hungry as a wolf/a hunter
as innocent(天真) as a dove
as keen as mustard(芥母)
as large as life
as light as air/a butterfly/a feather/a cork/thistledown/
as like as two peas/two drops of water/two pees/chalk and cheese
as loose as a rope of sand
as loud as thunder
as mad as a March hare/a hatter（帽商）
as mean(卑鄙) as Scrooge
as merry as a cricket
as motionless as statue
as mute as a fish/mice
as nimble(灵巧) as a squirrel
as noise as a mynah
as obstinate as a mule
as old as the hills
as pale as death/wax/a ghost
as patient as an ox
as plain as the nose on one's face/a pikestaff
as pleased as Punch
as playful as a kitten
as plentiful as blackberries
as plump（胖）as a partridge(鹌鹑）
as poor as a church mouse/a beggar
as pretty as a picture
as proud as a peacock
as pure as the world of all
as quick as lightning/thought
as quiet as a lamb/a mouse
as rapid as lightning
as red as fire/a rose/a cheery/blood/beetroot
as regular as clockwork
as rich as Jesus/Croesus
as rigid as a stone
as ripe as a cherry
as round as an apple /a glob/a barrel
as salty as a herring
as sharp as a needle/razor
as silent as a dead/the stars/the grave/sphinx/a morgue
as silly as a goose/a sheep
as slender as a gossamer（蜘蛛）
as slippery as an eel
as sly as a fox
as slow as a tortoise
as smooth as butter/oil/glass/velvet
as sober(严肃) as a judge
as soft as butter/silk/wax/down(绒毛）
as sound as a bell
as sour as a crab/vinegar
as steady as a rock
as stiff as a poke/a post/death/ a grave
as tough as leather /nails
as straight as an arrow
as tricky（聪明） as a monkey
as strong as a horse/a lion
as true as steel
as stubborn(固执) as a mule
as stupid as a donkey
as sure as death
as surely as the night follows the day
as sweet as honey/sugar
as swift as an arrow/lightning/the wind
as tall as a maypole/a steeple/a poplar
as tame(驯服) as a cat
as tender as chicken
as thick as cable/hail/a stone/ porridge/a wall
as thin as rake/ water/shipping post/a bag of bones/a lath
as timid as a hare/a rabbit/mice
as tough as leather/bulls
as tricky as a monkey
as true as steel
as ugly as scare/a crow/a toad
as unstable as the very devil
as vain as water/a peacock
as warm as taost
as watchful as a hawk
as weak as baby/a cat/kitten
as wet as water/a drowned cat
as white as snow/sheet/wool/flour
as wise as Solomon/a serpent/an owl
as yielding(服从) as wax

Answer 4

Answer 5